diff --git a/t/t0002-gitfile.sh b/t/t0002-gitfile.sh
index 0a396c95e5..8440e6add1 100755
--- a/t/t0002-gitfile.sh
+++ b/t/t0002-gitfile.sh
@@ -4,7 +4,7 @@ test_description='.git file
 
 Verify that plumbing commands work when .git is a file
 '
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -99,7 +99,7 @@ test_expect_success 'enter_repo non-strict mode' '
 	git ls-remote enter_repo >actual &&
 	cat >expected <<-EOF &&
 	$head	HEAD
-	$head	refs/heads/master
+	$head	refs/heads/main
 	$head	refs/tags/foo
 	EOF
 	test_cmp expected actual
@@ -114,7 +114,7 @@ test_expect_success 'enter_repo linked checkout' '
 	git ls-remote foo >actual &&
 	cat >expected <<-EOF &&
 	$head	HEAD
-	$head	refs/heads/master
+	$head	refs/heads/main
 	$head	refs/tags/foo
 	EOF
 	test_cmp expected actual
@@ -125,7 +125,7 @@ test_expect_success 'enter_repo strict mode' '
 	git ls-remote --upload-pack="git upload-pack --strict" foo/.git >actual &&
 	cat >expected <<-EOF &&
 	$head	HEAD
-	$head	refs/heads/master
+	$head	refs/heads/main
 	$head	refs/tags/foo
 	EOF
 	test_cmp expected actual
diff --git a/t/t0020-crlf.sh b/t/t0020-crlf.sh
index 0d43189048..375cf94398 100755
--- a/t/t0020-crlf.sh
+++ b/t/t0020-crlf.sh
@@ -2,7 +2,7 @@
 
 test_description='CRLF conversion'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -321,8 +321,8 @@ test_expect_success 'checkout with existing .gitattributes' '
 	git add .gitattributes .file &&
 	git commit -m second &&
 
-	git checkout master~1 &&
-	git checkout master &&
+	git checkout main~1 &&
+	git checkout main &&
 	test "$(git diff-files --raw)" = ""
 
 '
@@ -334,8 +334,8 @@ test_expect_success 'checkout when deleting .gitattributes' '
 	git add .file2 &&
 	git commit -m third &&
 
-	git checkout master~1 &&
-	git checkout master &&
+	git checkout main~1 &&
+	git checkout main &&
 	has_cr .file2
 
 '
diff --git a/t/t0021-conversion.sh b/t/t0021-conversion.sh
index adf862aef1..e4c4de5c74 100755
--- a/t/t0021-conversion.sh
+++ b/t/t0021-conversion.sh
@@ -2,7 +2,7 @@
 
 test_description='blob conversion via gitattributes'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -381,8 +381,8 @@ test_expect_success PERL 'required process filter should filter data' '
 		test_cmp_count expected.log debug.log &&
 
 		git commit -m "test commit 2" &&
-		MASTER=$(git rev-parse --verify master) &&
-		META="ref=refs/heads/master treeish=$MASTER" &&
+		MAIN=$(git rev-parse --verify main) &&
+		META="ref=refs/heads/main treeish=$MAIN" &&
 		rm -f test2.r "testsubdir/test3 '\''sq'\'',\$x=.r" &&
 
 		filter_git checkout --quiet --no-progress . &&
@@ -407,7 +407,7 @@ test_expect_success PERL 'required process filter should filter data' '
 		EOF
 		test_cmp_exclude_clean expected.log debug.log &&
 
-		filter_git checkout --quiet --no-progress master &&
+		filter_git checkout --quiet --no-progress main &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
@@ -439,15 +439,15 @@ test_expect_success PERL 'required process filter should filter data for various
 		M3=$(git hash-object "testsubdir/test3 '\''sq'\'',\$x=.r") &&
 		EMPTY=$(git hash-object /dev/null) &&
 
-		MASTER=$(git rev-parse --verify master) &&
+		MAIN=$(git rev-parse --verify main) &&
 
 		cp "$TEST_ROOT/test.o" test5.r &&
 		git add test5.r &&
 		git commit -m "test commit 3" &&
 		git checkout empty-branch &&
-		filter_git rebase --onto empty-branch master^^ master &&
-		MASTER2=$(git rev-parse --verify master) &&
-		META="ref=refs/heads/master treeish=$MASTER2" &&
+		filter_git rebase --onto empty-branch main^^ main &&
+		MAIN2=$(git rev-parse --verify main) &&
+		META="ref=refs/heads/main treeish=$MAIN2" &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
@@ -461,8 +461,8 @@ test_expect_success PERL 'required process filter should filter data for various
 		test_cmp_exclude_clean expected.log debug.log &&
 
 		git reset --hard empty-branch &&
-		filter_git reset --hard $MASTER &&
-		META="treeish=$MASTER" &&
+		filter_git reset --hard $MAIN &&
+		META="treeish=$MAIN" &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
@@ -474,10 +474,10 @@ test_expect_success PERL 'required process filter should filter data for various
 		EOF
 		test_cmp_exclude_clean expected.log debug.log &&
 
-		git branch old-master $MASTER &&
+		git branch old-main $MAIN &&
 		git reset --hard empty-branch &&
-		filter_git reset --hard old-master &&
-		META="ref=refs/heads/old-master treeish=$MASTER" &&
+		filter_git reset --hard old-main &&
+		META="ref=refs/heads/old-main treeish=$MAIN" &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
@@ -490,9 +490,9 @@ test_expect_success PERL 'required process filter should filter data for various
 		test_cmp_exclude_clean expected.log debug.log &&
 
 		git checkout -b merge empty-branch &&
-		git branch -f master $MASTER2 &&
-		filter_git merge master &&
-		META="treeish=$MASTER2" &&
+		git branch -f main $MAIN2 &&
+		filter_git merge main &&
+		META="treeish=$MAIN2" &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
@@ -505,8 +505,8 @@ test_expect_success PERL 'required process filter should filter data for various
 		EOF
 		test_cmp_exclude_clean expected.log debug.log &&
 
-		filter_git archive master >/dev/null &&
-		META="ref=refs/heads/master treeish=$MASTER2" &&
+		filter_git archive main >/dev/null &&
+		META="ref=refs/heads/main treeish=$MAIN2" &&
 		cat >expected.log <<-EOF &&
 			START
 			init handshake complete
@@ -519,7 +519,7 @@ test_expect_success PERL 'required process filter should filter data for various
 		EOF
 		test_cmp_exclude_clean expected.log debug.log &&
 
-		TREE="$(git rev-parse $MASTER2^{tree})" &&
+		TREE="$(git rev-parse $MAIN2^{tree})" &&
 		filter_git archive $TREE >/dev/null &&
 		META="treeish=$TREE" &&
 		cat >expected.log <<-EOF &&
@@ -859,8 +859,8 @@ test_expect_success PERL 'delayed checkout in process filter' '
 	) &&
 
 	S=$(test_file_size "$TEST_ROOT/test.o") &&
-	PM="ref=refs/heads/master treeish=$(git -C repo rev-parse --verify master) " &&
-	M="${PM}blob=$(git -C repo rev-parse --verify master:test.a)" &&
+	PM="ref=refs/heads/main treeish=$(git -C repo rev-parse --verify main) " &&
+	M="${PM}blob=$(git -C repo rev-parse --verify main:test.a)" &&
 	cat >a.exp <<-EOF &&
 		START
 		init handshake complete
diff --git a/t/t0027-auto-crlf.sh b/t/t0027-auto-crlf.sh
index 9fcd56fab3..51f74a3ddf 100755
--- a/t/t0027-auto-crlf.sh
+++ b/t/t0027-auto-crlf.sh
@@ -368,9 +368,9 @@ test_expect_success 'ls-files --eol -o Text/Binary' '
 	test_cmp expect actual
 '
 
-test_expect_success 'setup master' '
+test_expect_success 'setup main' '
 	echo >.gitattributes &&
-	git checkout -b master &&
+	git checkout -b main &&
 	git add .gitattributes &&
 	git commit -m "add .gitattributes" . &&
 	printf "\$Id: 0000000000000000000000000000000000000000 \$\nLINEONE\nLINETWO\nLINETHREE"     >LF &&
diff --git a/t/t0028-working-tree-encoding.sh b/t/t0028-working-tree-encoding.sh
index ccdc91c41c..f970a9806b 100755
--- a/t/t0028-working-tree-encoding.sh
+++ b/t/t0028-working-tree-encoding.sh
@@ -2,7 +2,7 @@
 
 test_description='working-tree-encoding conversion via gitattributes'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -218,7 +218,7 @@ test_expect_success 'error if encoding round trip is not the same during refresh
 	TEST_HASH=$(git hash-object --no-filters -w nonsense.utf16le) &&
 	git update-index --add --cacheinfo 100644 $TEST_HASH nonsense.utf16le &&
 	COMMIT=$(git commit-tree -p $(git rev-parse HEAD) -m "plain commit" $(git write-tree)) &&
-	git update-ref refs/heads/master $COMMIT &&
+	git update-ref refs/heads/main $COMMIT &&
 
 	test_must_fail git checkout HEAD^ 2>err.out &&
 	test_i18ngrep "error: .* overwritten by checkout:" err.out
@@ -234,7 +234,7 @@ test_expect_success 'error if encoding garbage is already in Git' '
 	TEST_HASH=$(git hash-object --no-filters -w nonsense.utf16) &&
 	git update-index --add --cacheinfo 100644 $TEST_HASH nonsense.utf16 &&
 	COMMIT=$(git commit-tree -p $(git rev-parse HEAD) -m "plain commit" $(git write-tree)) &&
-	git update-ref refs/heads/master $COMMIT &&
+	git update-ref refs/heads/main $COMMIT &&
 
 	git diff 2>err.out &&
 	test_i18ngrep "error: BOM is required" err.out
diff --git a/t/t0041-usage.sh b/t/t0041-usage.sh
index 068b784e72..c4fc34eb18 100755
--- a/t/t0041-usage.sh
+++ b/t/t0041-usage.sh
@@ -2,7 +2,7 @@
 
 test_description='Test commands behavior when given invalid argument value'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -44,8 +44,8 @@ test_expect_success 'tag usage error' '
 '
 
 test_expect_success 'branch --contains <existent_commit>' '
-	git branch --contains "master" >actual 2>actual.err &&
-	test_i18ngrep "master" actual &&
+	git branch --contains "main" >actual 2>actual.err &&
+	test_i18ngrep "main" actual &&
 	test_line_count = 0 actual.err
 '
 
@@ -57,7 +57,7 @@ test_expect_success 'branch --contains <inexistent_commit>' '
 '
 
 test_expect_success 'branch --no-contains <existent_commit>' '
-	git branch --no-contains "master" >actual 2>actual.err &&
+	git branch --no-contains "main" >actual 2>actual.err &&
 	test_line_count = 0 actual &&
 	test_line_count = 0 actual.err
 '
@@ -76,7 +76,7 @@ test_expect_success 'branch usage error' '
 '
 
 test_expect_success 'for-each-ref --contains <existent_object>' '
-	git for-each-ref --contains "master" >actual 2>actual.err &&
+	git for-each-ref --contains "main" >actual 2>actual.err &&
 	test_line_count = 2 actual &&
 	test_line_count = 0 actual.err
 '
@@ -89,7 +89,7 @@ test_expect_success 'for-each-ref --contains <inexistent_object>' '
 '
 
 test_expect_success 'for-each-ref --no-contains <existent_object>' '
-	git for-each-ref --no-contains "master" >actual 2>actual.err &&
+	git for-each-ref --no-contains "main" >actual 2>actual.err &&
 	test_line_count = 0 actual &&
 	test_line_count = 0 actual.err
 '
diff --git a/t/t0050-filesystem.sh b/t/t0050-filesystem.sh
index 368f7d515b..afc343cf9b 100755
--- a/t/t0050-filesystem.sh
+++ b/t/t0050-filesystem.sh
@@ -2,7 +2,7 @@
 
 test_description='Various filesystem issues'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -68,7 +68,7 @@ test_expect_success "setup case tests" '
 	git mv camelcase tmp &&
 	git mv tmp CamelCase &&
 	git commit -m "rename" &&
-	git checkout -f master
+	git checkout -f main
 '
 
 test_expect_success 'rename (case change)' '
@@ -121,7 +121,7 @@ test_expect_success "setup unicode normalization tests" '
 	git mv $aumlcdiar tmp &&
 	git mv tmp "$auml" &&
 	git commit -m rename &&
-	git checkout -f master
+	git checkout -f main
 '
 
 $test_unicode 'rename (silent unicode normalization)' '
@@ -150,7 +150,7 @@ test_expect_success CASE_INSENSITIVE_FS 'checkout with no pathspec and a case in
 		git add gitweb &&
 		git commit -m "add gitweb/subdir/file" &&
 
-		git checkout master
+		git checkout main
 	)
 '
 
diff --git a/t/t0060-path-utils.sh b/t/t0060-path-utils.sh
index 928eebbdc0..fab077b6f7 100755
--- a/t/t0060-path-utils.sh
+++ b/t/t0060-path-utils.sh
@@ -312,8 +312,8 @@ test_git_path GIT_COMMON_DIR=bar info/sparse-checkout     .git/info/sparse-check
 test_git_path GIT_COMMON_DIR=bar info//sparse-checkout    .git/info//sparse-checkout
 test_git_path GIT_COMMON_DIR=bar remotes/bar              bar/remotes/bar
 test_git_path GIT_COMMON_DIR=bar branches/bar             bar/branches/bar
-test_git_path GIT_COMMON_DIR=bar logs/refs/heads/master     bar/logs/refs/heads/master
-test_git_path GIT_COMMON_DIR=bar refs/heads/master          bar/refs/heads/master
+test_git_path GIT_COMMON_DIR=bar logs/refs/heads/main     bar/logs/refs/heads/main
+test_git_path GIT_COMMON_DIR=bar refs/heads/main          bar/refs/heads/main
 test_git_path GIT_COMMON_DIR=bar refs/bisect/foo          .git/refs/bisect/foo
 test_git_path GIT_COMMON_DIR=bar hooks/me                 bar/hooks/me
 test_git_path GIT_COMMON_DIR=bar config                   bar/config
diff --git a/t/t0100-previous.sh b/t/t0100-previous.sh
index c3c2770ab3..69beb59f62 100755
--- a/t/t0100-previous.sh
+++ b/t/t0100-previous.sh
@@ -2,7 +2,7 @@
 
 test_description='previous branch syntax @{-n}'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -11,7 +11,7 @@ test_expect_success 'branch -d @{-1}' '
 	test_commit A &&
 	git checkout -b junk &&
 	git checkout - &&
-	test "$(git symbolic-ref HEAD)" = refs/heads/master &&
+	test "$(git symbolic-ref HEAD)" = refs/heads/main &&
 	git branch -d @{-1} &&
 	test_must_fail git rev-parse --verify refs/heads/junk
 '
@@ -20,9 +20,9 @@ test_expect_success 'branch -d @{-12} when there is not enough switches yet' '
 	git reflog expire --expire=now &&
 	git checkout -b junk2 &&
 	git checkout - &&
-	test "$(git symbolic-ref HEAD)" = refs/heads/master &&
+	test "$(git symbolic-ref HEAD)" = refs/heads/main &&
 	test_must_fail git branch -d @{-12} &&
-	git rev-parse --verify refs/heads/master
+	git rev-parse --verify refs/heads/main
 '
 
 test_expect_success 'merge @{-1}' '
@@ -31,19 +31,19 @@ test_expect_success 'merge @{-1}' '
 	git checkout A &&
 	test_commit C &&
 	test_commit D &&
-	git branch -f master B &&
+	git branch -f main B &&
 	git branch -f other &&
 	git checkout other &&
-	git checkout master &&
+	git checkout main &&
 	git merge @{-1} &&
 	git cat-file commit HEAD | grep "Merge branch '\''other'\''"
 '
 
 test_expect_success 'merge @{-1}~1' '
-	git checkout master &&
+	git checkout main &&
 	git reset --hard B &&
 	git checkout other &&
-	git checkout master &&
+	git checkout main &&
 	git merge @{-1}~1 &&
 	git cat-file commit HEAD >actual &&
 	grep "Merge branch '\''other'\''" actual
@@ -51,11 +51,11 @@ test_expect_success 'merge @{-1}~1' '
 
 test_expect_success 'merge @{-100} before checking out that many branches yet' '
 	git reflog expire --expire=now &&
-	git checkout -f master &&
+	git checkout -f main &&
 	git reset --hard B &&
 	git branch -f other C &&
 	git checkout other &&
-	git checkout master &&
+	git checkout main &&
 	test_must_fail git merge @{-100}
 '
 
diff --git a/t/t1004-read-tree-m-u-wf.sh b/t/t1004-read-tree-m-u-wf.sh
index 57caa3a73f..11bf10424f 100755
--- a/t/t1004-read-tree-m-u-wf.sh
+++ b/t/t1004-read-tree-m-u-wf.sh
@@ -2,7 +2,7 @@
 
 test_description='read-tree -m -u checks working tree files'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -23,17 +23,17 @@ test_expect_success 'two-way setup' '
 	git branch side &&
 	git tag -f branch-point &&
 
-	echo file2 is not tracked on the master branch anymore &&
+	echo file2 is not tracked on the main branch anymore &&
 	rm -f file2 subdir/file2 &&
 	git update-index --remove file2 subdir/file2 &&
-	git commit -a -m "master removes file2 and subdir/file2"
+	git commit -a -m "main removes file2 and subdir/file2"
 '
 
 test_expect_success 'two-way not clobbering' '
 
-	echo >file2 master creates untracked file2 &&
-	echo >subdir/file2 master creates untracked subdir/file2 &&
-	if err=$(read_tree_u_must_succeed -m -u master side 2>&1)
+	echo >file2 main creates untracked file2 &&
+	echo >subdir/file2 main creates untracked subdir/file2 &&
+	if err=$(read_tree_u_must_succeed -m -u main side 2>&1)
 	then
 		echo should have complained
 		false
@@ -46,7 +46,7 @@ echo file2 >.gitignore
 
 test_expect_success 'two-way with incorrect --exclude-per-directory (1)' '
 
-	if err=$(read_tree_u_must_succeed -m --exclude-per-directory=.gitignore master side 2>&1)
+	if err=$(read_tree_u_must_succeed -m --exclude-per-directory=.gitignore main side 2>&1)
 	then
 		echo should have complained
 		false
@@ -57,7 +57,7 @@ test_expect_success 'two-way with incorrect --exclude-per-directory (1)' '
 
 test_expect_success 'two-way with incorrect --exclude-per-directory (2)' '
 
-	if err=$(read_tree_u_must_succeed -m -u --exclude-per-directory=foo --exclude-per-directory=.gitignore master side 2>&1)
+	if err=$(read_tree_u_must_succeed -m -u --exclude-per-directory=foo --exclude-per-directory=.gitignore main side 2>&1)
 	then
 		echo should have complained
 		false
@@ -68,7 +68,7 @@ test_expect_success 'two-way with incorrect --exclude-per-directory (2)' '
 
 test_expect_success 'two-way clobbering a ignored file' '
 
-	read_tree_u_must_succeed -m -u --exclude-per-directory=.gitignore master side
+	read_tree_u_must_succeed -m -u --exclude-per-directory=.gitignore main side
 '
 
 rm -f .gitignore
@@ -84,21 +84,21 @@ test_expect_success 'three-way not complaining on an untracked path in both' '
 	git update-index --add file3 subdir/file3 &&
 	git commit -a -m "side adds file3 and removes file2" &&
 
-	git checkout master &&
-	echo >file2 file two is untracked on the master side &&
-	echo >subdir/file2 file two is untracked on the master side &&
+	git checkout main &&
+	echo >file2 file two is untracked on the main side &&
+	echo >subdir/file2 file two is untracked on the main side &&
 
-	read_tree_u_must_succeed -m -u branch-point master side
+	read_tree_u_must_succeed -m -u branch-point main side
 '
 
 test_expect_success 'three-way not clobbering a working tree file' '
 
 	git reset --hard &&
 	rm -f file2 subdir/file2 file3 subdir/file3 &&
-	git checkout master &&
-	echo >file3 file three created in master, untracked &&
-	echo >subdir/file3 file three created in master, untracked &&
-	if err=$(read_tree_u_must_succeed -m -u branch-point master side 2>&1)
+	git checkout main &&
+	echo >file3 file three created in main, untracked &&
+	echo >subdir/file3 file three created in main, untracked &&
+	if err=$(read_tree_u_must_succeed -m -u branch-point main side 2>&1)
 	then
 		echo should have complained
 		false
@@ -113,11 +113,11 @@ test_expect_success 'three-way not complaining on an untracked file' '
 
 	git reset --hard &&
 	rm -f file2 subdir/file2 file3 subdir/file3 &&
-	git checkout master &&
-	echo >file3 file three created in master, untracked &&
-	echo >subdir/file3 file three created in master, untracked &&
+	git checkout main &&
+	echo >file3 file three created in main, untracked &&
+	echo >subdir/file3 file three created in main, untracked &&
 
-	read_tree_u_must_succeed -m -u --exclude-per-directory=.gitignore branch-point master side
+	read_tree_u_must_succeed -m -u --exclude-per-directory=.gitignore branch-point main side
 '
 
 test_expect_success '3-way not overwriting local changes (setup)' '
diff --git a/t/t1008-read-tree-overlay.sh b/t/t1008-read-tree-overlay.sh
index edb89447c7..4512fb0b6e 100755
--- a/t/t1008-read-tree-overlay.sh
+++ b/t/t1008-read-tree-overlay.sh
@@ -2,7 +2,7 @@
 
 test_description='test multi-tree read-tree without merging'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -25,7 +25,7 @@ test_expect_success setup '
 '
 
 test_expect_success 'multi-read' '
-	read_tree_must_succeed initial master side &&
+	read_tree_must_succeed initial main side &&
 	test_write_lines a b/c >expect &&
 	git ls-files >actual &&
 	test_cmp expect actual
diff --git a/t/t1009-read-tree-new-index.sh b/t/t1009-read-tree-new-index.sh
index b9bab37ac0..2935f68f8d 100755
--- a/t/t1009-read-tree-new-index.sh
+++ b/t/t1009-read-tree-new-index.sh
@@ -2,7 +2,7 @@
 
 test_description='test read-tree into a fresh index file'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -15,13 +15,13 @@ test_expect_success setup '
 
 test_expect_success 'non-existent index file' '
 	rm -f new-index &&
-	GIT_INDEX_FILE=new-index git read-tree master
+	GIT_INDEX_FILE=new-index git read-tree main
 '
 
 test_expect_success 'empty index file' '
 	rm -f new-index &&
 	> new-index &&
-	GIT_INDEX_FILE=new-index git read-tree master
+	GIT_INDEX_FILE=new-index git read-tree main
 '
 
 test_done
diff --git a/t/t1011-read-tree-sparse-checkout.sh b/t/t1011-read-tree-sparse-checkout.sh
index 140f459977..dfe9794a74 100755
--- a/t/t1011-read-tree-sparse-checkout.sh
+++ b/t/t1011-read-tree-sparse-checkout.sh
@@ -2,7 +2,7 @@
 
 test_description='sparse checkout tests
 
-* (tag: removed, master) removed
+* (tag: removed, main) removed
 | D	sub/added
 * (HEAD, tag: top) modified and added
 | M	init.t
diff --git a/t/t1021-rerere-in-workdir.sh b/t/t1021-rerere-in-workdir.sh
index 9177871c99..0b892894eb 100755
--- a/t/t1021-rerere-in-workdir.sh
+++ b/t/t1021-rerere-in-workdir.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 test_description='rerere run in a workdir'
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -22,7 +22,7 @@ test_expect_success SYMLINKS setup '
 	test_tick &&
 	git commit -a -m goodbye &&
 
-	git checkout master
+	git checkout main
 '
 
 test_expect_success SYMLINKS 'rerere in workdir' '
diff --git a/t/t1090-sparse-checkout-scope.sh b/t/t1090-sparse-checkout-scope.sh
index d731322633..3deb490187 100755
--- a/t/t1090-sparse-checkout-scope.sh
+++ b/t/t1090-sparse-checkout-scope.sh
@@ -2,7 +2,7 @@
 
 test_description='sparse checkout scope tests'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -23,18 +23,18 @@ test_expect_success 'create feature branch' '
 	git commit -m "modification"
 '
 
-test_expect_success 'perform sparse checkout of master' '
+test_expect_success 'perform sparse checkout of main' '
 	git config --local --bool core.sparsecheckout true &&
 	echo "!/*" >.git/info/sparse-checkout &&
 	echo "/a" >>.git/info/sparse-checkout &&
 	echo "/c" >>.git/info/sparse-checkout &&
-	git checkout master &&
+	git checkout main &&
 	test_path_is_file a &&
 	test_path_is_missing b &&
 	test_path_is_file c
 '
 
-test_expect_success 'merge feature branch into sparse checkout of master' '
+test_expect_success 'merge feature branch into sparse checkout of main' '
 	git merge feature &&
 	test_path_is_file a &&
 	test_path_is_missing b &&
@@ -42,10 +42,10 @@ test_expect_success 'merge feature branch into sparse checkout of master' '
 	test "$(cat c)" = "modified"
 '
 
-test_expect_success 'return to full checkout of master' '
+test_expect_success 'return to full checkout of main' '
 	git checkout feature &&
 	echo "/*" >.git/info/sparse-checkout &&
-	git checkout master &&
+	git checkout main &&
 	test_path_is_file a &&
 	test_path_is_file b &&
 	test_path_is_file c &&
diff --git a/t/t1091-sparse-checkout-builtin.sh b/t/t1091-sparse-checkout-builtin.sh
index 25e68ca036..fc64e9ed99 100755
--- a/t/t1091-sparse-checkout-builtin.sh
+++ b/t/t1091-sparse-checkout-builtin.sh
@@ -2,7 +2,7 @@
 
 test_description='sparse checkout builtin tests'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -120,7 +120,7 @@ test_expect_success 'interaction with clone --no-checkout (unborn index)' '
 	test_path_is_missing clone_no_checkout/.git/index &&
 
 	# No branch is checked out until we manually switch to one
-	git -C clone_no_checkout switch master &&
+	git -C clone_no_checkout switch main &&
 	test_path_is_file clone_no_checkout/.git/index &&
 	check_files clone_no_checkout a folder1
 '
diff --git a/t/t1300-config.sh b/t/t1300-config.sh
index 67e201b5c1..c809ab90f9 100755
--- a/t/t1300-config.sh
+++ b/t/t1300-config.sh
@@ -5,7 +5,7 @@
 
 test_description='Test git config in different settings'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -1057,8 +1057,8 @@ test_expect_success 'check split_cmdline return' "
 	echo foo > foo &&
 	git add foo &&
 	git commit -m 'initial commit' &&
-	git config branch.master.mergeoptions 'echo \"' &&
-	test_must_fail git merge master
+	git config branch.main.mergeoptions 'echo \"' &&
+	test_must_fail git merge main
 "
 
 test_expect_success 'git -c "key=value" support' '
@@ -1772,11 +1772,11 @@ test_expect_success '--show-origin blob' '
 
 test_expect_success '--show-origin blob ref' '
 	cat >expect <<-\EOF &&
-	blob:master:custom.conf	user.custom=true
+	blob:main:custom.conf	user.custom=true
 	EOF
 	git add "$CUSTOM_CONFIG_FILE" &&
 	git commit -m "new config file" &&
-	git config --blob=master:"$CUSTOM_CONFIG_FILE" --show-origin --list >output &&
+	git config --blob=main:"$CUSTOM_CONFIG_FILE" --show-origin --list >output &&
 	test_cmp expect output
 '
 
diff --git a/t/t1301-shared-repo.sh b/t/t1301-shared-repo.sh
index c573438f98..ac947bff9f 100755
--- a/t/t1301-shared-repo.sh
+++ b/t/t1301-shared-repo.sh
@@ -5,7 +5,7 @@
 
 test_description='Test shared repository initialization'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -118,13 +118,13 @@ test_expect_success POSIXPERM 'git reflog expire honors core.sharedRepository' '
 	umask 077 &&
 	git config core.sharedRepository group &&
 	git reflog expire --all &&
-	actual="$(ls -l .git/logs/refs/heads/master)" &&
+	actual="$(ls -l .git/logs/refs/heads/main)" &&
 	case "$actual" in
 	-rw-rw-*)
 		: happy
 		;;
 	*)
-		echo Ooops, .git/logs/refs/heads/master is not 0662 [$actual]
+		echo Ooops, .git/logs/refs/heads/main is not 0662 [$actual]
 		false
 		;;
 	esac
diff --git a/t/t1305-config-include.sh b/t/t1305-config-include.sh
index f1e1b289f9..938ca17d78 100755
--- a/t/t1305-config-include.sh
+++ b/t/t1305-config-include.sh
@@ -312,7 +312,7 @@ test_expect_success SYMLINKS 'conditional include, gitdir matching symlink, icas
 test_expect_success 'conditional include, onbranch' '
 	echo "[includeIf \"onbranch:foo-branch\"]path=bar9" >>.git/config &&
 	echo "[test]nine=9" >.git/bar9 &&
-	git checkout -b master &&
+	git checkout -b main &&
 	test_must_fail git config test.nine &&
 	git checkout -b foo-branch &&
 	echo 9 >expect &&
diff --git a/t/t1400-update-ref.sh b/t/t1400-update-ref.sh
index 4ae6f50c02..1ad0bbbc53 100755
--- a/t/t1400-update-ref.sh
+++ b/t/t1400-update-ref.sh
@@ -4,14 +4,14 @@
 #
 
 test_description='Test git update-ref and basic ref logging'
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
 
 Z=$ZERO_OID
 
-m=refs/heads/master
+m=refs/heads/main
 n_dir=refs/heads/gu
 n=$n_dir/fixes
 outside=refs/foo
@@ -261,7 +261,7 @@ test_expect_success "(not) changed .git/$m" '
 	! test $B = $(git show-ref -s --verify $m)
 '
 
-rm -f .git/logs/refs/heads/master
+rm -f .git/logs/refs/heads/main
 test_expect_success "create $m (logged by touch)" '
 	test_config core.logAllRefUpdates false &&
 	GIT_COMMITTER_DATE="2005-05-26 23:30" \
@@ -297,7 +297,7 @@ test_expect_success 'symref empty directory removal' '
 	git branch e1/e2/r1 HEAD &&
 	git branch e1/r2 HEAD &&
 	git checkout e1/e2/r1 &&
-	test_when_finished "git checkout master" &&
+	test_when_finished "git checkout main" &&
 	test_path_is_file .git/refs/heads/e1/e2/r1 &&
 	test_path_is_file .git/logs/refs/heads/e1/e2/r1 &&
 	git update-ref -d HEAD &&
@@ -361,68 +361,68 @@ test_expect_success 'set up for querying the reflog' '
 ed="Thu, 26 May 2005 18:32:00 -0500"
 gd="Thu, 26 May 2005 18:33:00 -0500"
 ld="Thu, 26 May 2005 18:43:00 -0500"
-test_expect_success 'Query "master@{May 25 2005}" (before history)' '
+test_expect_success 'Query "main@{May 25 2005}" (before history)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify "master@{May 25 2005}" >o 2>e &&
+	git rev-parse --verify "main@{May 25 2005}" >o 2>e &&
 	echo "$C" >expect &&
 	test_cmp expect o &&
-	echo "warning: log for '\''master'\'' only goes back to $ed" >expect &&
+	echo "warning: log for '\''main'\'' only goes back to $ed" >expect &&
 	test_i18ncmp expect e
 '
-test_expect_success 'Query master@{2005-05-25} (before history)' '
+test_expect_success 'Query main@{2005-05-25} (before history)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify master@{2005-05-25} >o 2>e &&
+	git rev-parse --verify main@{2005-05-25} >o 2>e &&
 	echo "$C" >expect &&
 	test_cmp expect o &&
-	echo "warning: log for '\''master'\'' only goes back to $ed" >expect &&
+	echo "warning: log for '\''main'\'' only goes back to $ed" >expect &&
 	test_i18ncmp expect e
 '
-test_expect_success 'Query "master@{May 26 2005 23:31:59}" (1 second before history)' '
+test_expect_success 'Query "main@{May 26 2005 23:31:59}" (1 second before history)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify "master@{May 26 2005 23:31:59}" >o 2>e &&
+	git rev-parse --verify "main@{May 26 2005 23:31:59}" >o 2>e &&
 	echo "$C" >expect &&
 	test_cmp expect o &&
-	echo "warning: log for '\''master'\'' only goes back to $ed" >expect &&
+	echo "warning: log for '\''main'\'' only goes back to $ed" >expect &&
 	test_i18ncmp expect e
 '
-test_expect_success 'Query "master@{May 26 2005 23:32:00}" (exactly history start)' '
+test_expect_success 'Query "main@{May 26 2005 23:32:00}" (exactly history start)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify "master@{May 26 2005 23:32:00}" >o 2>e &&
+	git rev-parse --verify "main@{May 26 2005 23:32:00}" >o 2>e &&
 	echo "$C" >expect &&
 	test_cmp expect o &&
 	test_must_be_empty e
 '
-test_expect_success 'Query "master@{May 26 2005 23:32:30}" (first non-creation change)' '
+test_expect_success 'Query "main@{May 26 2005 23:32:30}" (first non-creation change)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify "master@{May 26 2005 23:32:30}" >o 2>e &&
+	git rev-parse --verify "main@{May 26 2005 23:32:30}" >o 2>e &&
 	echo "$A" >expect &&
 	test_cmp expect o &&
 	test_must_be_empty e
 '
-test_expect_success 'Query "master@{2005-05-26 23:33:01}" (middle of history with gap)' '
+test_expect_success 'Query "main@{2005-05-26 23:33:01}" (middle of history with gap)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify "master@{2005-05-26 23:33:01}" >o 2>e &&
+	git rev-parse --verify "main@{2005-05-26 23:33:01}" >o 2>e &&
 	echo "$B" >expect &&
 	test_cmp expect o &&
 	test_i18ngrep -F "warning: log for ref $m has gap after $gd" e
 '
-test_expect_success 'Query "master@{2005-05-26 23:38:00}" (middle of history)' '
+test_expect_success 'Query "main@{2005-05-26 23:38:00}" (middle of history)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify "master@{2005-05-26 23:38:00}" >o 2>e &&
+	git rev-parse --verify "main@{2005-05-26 23:38:00}" >o 2>e &&
 	echo "$Z" >expect &&
 	test_cmp expect o &&
 	test_must_be_empty e
 '
-test_expect_success 'Query "master@{2005-05-26 23:43:00}" (exact end of history)' '
+test_expect_success 'Query "main@{2005-05-26 23:43:00}" (exact end of history)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify "master@{2005-05-26 23:43:00}" >o 2>e &&
+	git rev-parse --verify "main@{2005-05-26 23:43:00}" >o 2>e &&
 	echo "$E" >expect &&
 	test_cmp expect o &&
 	test_must_be_empty e
 '
-test_expect_success 'Query "master@{2005-05-28}" (past end of history)' '
+test_expect_success 'Query "main@{2005-05-28}" (past end of history)' '
 	test_when_finished "rm -f o e" &&
-	git rev-parse --verify "master@{2005-05-28}" >o 2>e &&
+	git rev-parse --verify "main@{2005-05-28}" >o 2>e &&
 	echo "$D" >expect &&
 	test_cmp expect o &&
 	test_i18ngrep -F "warning: log for ref $m unexpectedly ended on $ld" e
@@ -464,14 +464,14 @@ test_expect_success 'git commit logged updates' '
 '
 unset h_TEST h_OTHER h_FIXED h_MERGED
 
-test_expect_success 'git cat-file blob master:F (expect OTHER)' '
-	test OTHER = $(git cat-file blob master:F)
+test_expect_success 'git cat-file blob main:F (expect OTHER)' '
+	test OTHER = $(git cat-file blob main:F)
 '
-test_expect_success 'git cat-file blob master@{2005-05-26 23:30}:F (expect TEST)' '
-	test TEST = $(git cat-file blob "master@{2005-05-26 23:30}:F")
+test_expect_success 'git cat-file blob main@{2005-05-26 23:30}:F (expect TEST)' '
+	test TEST = $(git cat-file blob "main@{2005-05-26 23:30}:F")
 '
-test_expect_success 'git cat-file blob master@{2005-05-26 23:42}:F (expect OTHER)' '
-	test OTHER = $(git cat-file blob "master@{2005-05-26 23:42}:F")
+test_expect_success 'git cat-file blob main@{2005-05-26 23:42}:F (expect OTHER)' '
+	test OTHER = $(git cat-file blob "main@{2005-05-26 23:42}:F")
 '
 
 # Test adding and deleting pseudorefs
@@ -583,9 +583,9 @@ test_expect_success 'stdin fails on unknown command' '
 '
 
 test_expect_success 'stdin fails on unbalanced quotes' '
-	echo "create $a \"master" >stdin &&
+	echo "create $a \"main" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
-	grep "fatal: badly quoted argument: \\\"master" err
+	grep "fatal: badly quoted argument: \\\"main" err
 '
 
 test_expect_success PREPARE_FOR_MAIN_BRANCH 'stdin fails on invalid escape' '
@@ -595,9 +595,9 @@ test_expect_success PREPARE_FOR_MAIN_BRANCH 'stdin fails on invalid escape' '
 '
 
 test_expect_success 'stdin fails on junk after quoted argument' '
-	echo "create \"$a\"master" >stdin &&
+	echo "create \"$a\"main" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
-	grep "fatal: unexpected character after quoted argument: \\\"$a\\\"master" err
+	grep "fatal: unexpected character after quoted argument: \\\"$a\\\"main" err
 '
 
 test_expect_success 'stdin fails create with no ref' '
diff --git a/t/t1402-check-ref-format.sh b/t/t1402-check-ref-format.sh
index 98e4a8613b..cabc516ae9 100755
--- a/t/t1402-check-ref-format.sh
+++ b/t/t1402-check-ref-format.sh
@@ -134,18 +134,18 @@ valid_ref !MINGW "$ref" '--refspec-pattern --allow-onelevel --normalize'
 test_expect_success "check-ref-format --branch @{-1}" '
 	T=$(git write-tree) &&
 	sha1=$(echo A | git commit-tree $T) &&
-	git update-ref refs/heads/master $sha1 &&
-	git update-ref refs/remotes/origin/master $sha1 &&
-	git checkout master &&
-	git checkout origin/master &&
-	git checkout master &&
+	git update-ref refs/heads/main $sha1 &&
+	git update-ref refs/remotes/origin/main $sha1 &&
+	git checkout main &&
+	git checkout origin/main &&
+	git checkout main &&
 	refname=$(git check-ref-format --branch @{-1}) &&
 	test "$refname" = "$sha1" &&
 	refname2=$(git check-ref-format --branch @{-2}) &&
-	test "$refname2" = master'
+	test "$refname2" = main'
 
-test_expect_success 'check-ref-format --branch -naster' '
-	test_must_fail git check-ref-format --branch -naster >actual &&
+test_expect_success 'check-ref-format --branch -nain' '
+	test_must_fail git check-ref-format --branch -nain >actual &&
 	test_must_be_empty actual
 '
 
@@ -154,11 +154,11 @@ test_expect_success 'check-ref-format --branch from subdir' '
 
 	T=$(git write-tree) &&
 	sha1=$(echo A | git commit-tree $T) &&
-	git update-ref refs/heads/master $sha1 &&
-	git update-ref refs/remotes/origin/master $sha1 &&
-	git checkout master &&
-	git checkout origin/master &&
-	git checkout master &&
+	git update-ref refs/heads/main $sha1 &&
+	git update-ref refs/remotes/origin/main $sha1 &&
+	git checkout main &&
+	git checkout origin/main &&
+	git checkout main &&
 	refname=$(
 		cd subdir &&
 		git check-ref-format --branch @{-1}
@@ -171,9 +171,9 @@ test_expect_success 'check-ref-format --branch @{-1} from non-repo' '
 	test_must_be_empty actual
 '
 
-test_expect_success 'check-ref-format --branch master from non-repo' '
-	echo master >expect &&
-	nongit git check-ref-format --branch master >actual &&
+test_expect_success 'check-ref-format --branch main from non-repo' '
+	echo main >expect &&
+	nongit git check-ref-format --branch main >actual &&
 	test_cmp expect actual
 '
 
diff --git a/t/t1403-show-ref.sh b/t/t1403-show-ref.sh
index aaf32f3b07..6ce62f878c 100755
--- a/t/t1403-show-ref.sh
+++ b/t/t1403-show-ref.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 test_description='show-ref'
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -12,7 +12,7 @@ test_expect_success setup '
 	git checkout -b side &&
 	test_commit B &&
 	git tag -f -a -m "annotated B" B &&
-	git checkout master &&
+	git checkout main &&
 	test_commit C &&
 	git branch B A^0
 '
@@ -95,23 +95,23 @@ test_expect_success 'show-ref -d' '
 	git show-ref --verify -d refs/tags/A refs/tags/C >actual &&
 	test_cmp expect actual &&
 
-	echo $(git rev-parse refs/heads/master) refs/heads/master >expect &&
-	git show-ref -d master >actual &&
+	echo $(git rev-parse refs/heads/main) refs/heads/main >expect &&
+	git show-ref -d main >actual &&
 	test_cmp expect actual &&
 
-	git show-ref -d heads/master >actual &&
+	git show-ref -d heads/main >actual &&
 	test_cmp expect actual &&
 
-	git show-ref -d refs/heads/master >actual &&
+	git show-ref -d refs/heads/main >actual &&
 	test_cmp expect actual &&
 
-	git show-ref -d --verify refs/heads/master >actual &&
+	git show-ref -d --verify refs/heads/main >actual &&
 	test_cmp expect actual &&
 
-	test_must_fail git show-ref -d --verify master >actual &&
+	test_must_fail git show-ref -d --verify main >actual &&
 	test_must_be_empty actual &&
 
-	test_must_fail git show-ref -d --verify heads/master >actual &&
+	test_must_fail git show-ref -d --verify heads/main >actual &&
 	test_must_be_empty actual &&
 
 	test_must_fail git show-ref --verify -d A C >actual &&
@@ -123,7 +123,7 @@ test_expect_success 'show-ref -d' '
 '
 
 test_expect_success 'show-ref --heads, --tags, --head, pattern' '
-	for branch in B master side
+	for branch in B main side
 	do
 		echo $(git rev-parse refs/heads/$branch) refs/heads/$branch
 	done >expect.heads &&
diff --git a/t/t1405-main-ref-store.sh b/t/t1405-main-ref-store.sh
index 531059b871..602e21957b 100755
--- a/t/t1405-main-ref-store.sh
+++ b/t/t1405-main-ref-store.sh
@@ -2,7 +2,7 @@
 
 test_description='test main ref store api'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -24,9 +24,9 @@ test_expect_success 'peel_ref(new-tag)' '
 	test_cmp expected actual
 '
 
-test_expect_success 'create_symref(FOO, refs/heads/master)' '
-	$RUN create-symref FOO refs/heads/master nothing &&
-	echo refs/heads/master >expected &&
+test_expect_success 'create_symref(FOO, refs/heads/main)' '
+	$RUN create-symref FOO refs/heads/main nothing &&
+	echo refs/heads/main >expected &&
 	git symbolic-ref FOO >actual &&
 	test_cmp expected actual
 '
@@ -34,7 +34,7 @@ test_expect_success 'create_symref(FOO, refs/heads/master)' '
 test_expect_success 'delete_refs(FOO, refs/tags/new-tag)' '
 	git rev-parse FOO -- &&
 	git rev-parse refs/tags/new-tag -- &&
-	m=$(git rev-parse master) &&
+	m=$(git rev-parse main) &&
 	REF_NO_DEREF=1 &&
 	$RUN delete-refs $REF_NO_DEREF nothing FOO refs/tags/new-tag &&
 	test_must_fail git rev-parse --symbolic-full-name FOO &&
@@ -42,19 +42,19 @@ test_expect_success 'delete_refs(FOO, refs/tags/new-tag)' '
 	test_must_fail git rev-parse refs/tags/new-tag --
 '
 
-test_expect_success 'rename_refs(master, new-master)' '
-	git rev-parse master >expected &&
-	$RUN rename-ref refs/heads/master refs/heads/new-master &&
-	git rev-parse new-master >actual &&
+test_expect_success 'rename_refs(main, new-main)' '
+	git rev-parse main >expected &&
+	$RUN rename-ref refs/heads/main refs/heads/new-main &&
+	git rev-parse new-main >actual &&
 	test_cmp expected actual &&
-	test_commit recreate-master
+	test_commit recreate-main
 '
 
 test_expect_success 'for_each_ref(refs/heads/)' '
 	$RUN for-each-ref refs/heads/ | cut -d" " -f 2- >actual &&
 	cat >expected <<-\EOF &&
-	master 0x0
-	new-master 0x0
+	main 0x0
+	new-main 0x0
 	EOF
 	test_cmp expected actual
 '
@@ -65,23 +65,23 @@ test_expect_success 'for_each_ref() is sorted' '
 	test_cmp expected actual
 '
 
-test_expect_success 'resolve_ref(new-master)' '
-	SHA1=`git rev-parse new-master` &&
-	echo "$SHA1 refs/heads/new-master 0x0" >expected &&
-	$RUN resolve-ref refs/heads/new-master 0 >actual &&
+test_expect_success 'resolve_ref(new-main)' '
+	SHA1=`git rev-parse new-main` &&
+	echo "$SHA1 refs/heads/new-main 0x0" >expected &&
+	$RUN resolve-ref refs/heads/new-main 0 >actual &&
 	test_cmp expected actual
 '
 
-test_expect_success 'verify_ref(new-master)' '
-	$RUN verify-ref refs/heads/new-master
+test_expect_success 'verify_ref(new-main)' '
+	$RUN verify-ref refs/heads/new-main
 '
 
 test_expect_success 'for_each_reflog()' '
 	$RUN for-each-reflog | sort -k2 | cut -d" " -f 2- >actual &&
 	cat >expected <<-\EOF &&
 	HEAD 0x1
-	refs/heads/master 0x0
-	refs/heads/new-master 0x0
+	refs/heads/main 0x0
+	refs/heads/new-main 0x0
 	EOF
 	test_cmp expected actual
 '
@@ -89,12 +89,12 @@ test_expect_success 'for_each_reflog()' '
 test_expect_success 'for_each_reflog_ent()' '
 	$RUN for-each-reflog-ent HEAD >actual &&
 	head -n1 actual | grep one &&
-	tail -n2 actual | head -n1 | grep recreate-master
+	tail -n2 actual | head -n1 | grep recreate-main
 '
 
 test_expect_success 'for_each_reflog_ent_reverse()' '
 	$RUN for-each-reflog-ent-reverse HEAD >actual &&
-	head -n1 actual | grep recreate-master &&
+	head -n1 actual | grep recreate-main &&
 	tail -n2 actual | head -n1 | grep one
 '
 
diff --git a/t/t1406-submodule-ref-store.sh b/t/t1406-submodule-ref-store.sh
index 126518c155..a68c8f11a2 100755
--- a/t/t1406-submodule-ref-store.sh
+++ b/t/t1406-submodule-ref-store.sh
@@ -2,7 +2,7 @@
 
 test_description='test submodule ref store api'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -14,7 +14,7 @@ test_expect_success 'setup' '
 	(
 		cd sub &&
 		test_commit first &&
-		git checkout -b new-master
+		git checkout -b new-main
 	)
 '
 
@@ -30,7 +30,7 @@ test_expect_success 'peel_ref(new-tag)' '
 '
 
 test_expect_success 'create_symref() not allowed' '
-	test_must_fail $RUN create-symref FOO refs/heads/master nothing
+	test_must_fail $RUN create-symref FOO refs/heads/main nothing
 '
 
 test_expect_success 'delete_refs() not allowed' '
@@ -38,14 +38,14 @@ test_expect_success 'delete_refs() not allowed' '
 '
 
 test_expect_success 'rename_refs() not allowed' '
-	test_must_fail $RUN rename-ref refs/heads/master refs/heads/new-master
+	test_must_fail $RUN rename-ref refs/heads/main refs/heads/new-main
 '
 
 test_expect_success 'for_each_ref(refs/heads/)' '
 	$RUN for-each-ref refs/heads/ | cut -d" " -f 2- >actual &&
 	cat >expected <<-\EOF &&
-	master 0x0
-	new-master 0x0
+	main 0x0
+	new-main 0x0
 	EOF
 	test_cmp expected actual
 '
@@ -56,23 +56,23 @@ test_expect_success 'for_each_ref() is sorted' '
 	test_cmp expected actual
 '
 
-test_expect_success 'resolve_ref(master)' '
-	SHA1=`git -C sub rev-parse master` &&
-	echo "$SHA1 refs/heads/master 0x0" >expected &&
-	$RUN resolve-ref refs/heads/master 0 >actual &&
+test_expect_success 'resolve_ref(main)' '
+	SHA1=`git -C sub rev-parse main` &&
+	echo "$SHA1 refs/heads/main 0x0" >expected &&
+	$RUN resolve-ref refs/heads/main 0 >actual &&
 	test_cmp expected actual
 '
 
-test_expect_success 'verify_ref(new-master)' '
-	$RUN verify-ref refs/heads/new-master
+test_expect_success 'verify_ref(new-main)' '
+	$RUN verify-ref refs/heads/new-main
 '
 
 test_expect_success 'for_each_reflog()' '
 	$RUN for-each-reflog | sort | cut -d" " -f 2- >actual &&
 	cat >expected <<-\EOF &&
 	HEAD 0x1
-	refs/heads/master 0x0
-	refs/heads/new-master 0x0
+	refs/heads/main 0x0
+	refs/heads/new-main 0x0
 	EOF
 	test_cmp expected actual
 '
@@ -80,12 +80,12 @@ test_expect_success 'for_each_reflog()' '
 test_expect_success 'for_each_reflog_ent()' '
 	$RUN for-each-reflog-ent HEAD >actual &&
 	head -n1 actual | grep first &&
-	tail -n2 actual | head -n1 | grep master.to.new
+	tail -n2 actual | head -n1 | grep main.to.new
 '
 
 test_expect_success 'for_each_reflog_ent_reverse()' '
 	$RUN for-each-reflog-ent-reverse HEAD >actual &&
-	head -n1 actual | grep master.to.new &&
+	head -n1 actual | grep main.to.new &&
 	tail -n2 actual | head -n1 | grep first
 '
 
diff --git a/t/t1407-worktree-ref-store.sh b/t/t1407-worktree-ref-store.sh
index aede1c20d7..d3fe777511 100755
--- a/t/t1407-worktree-ref-store.sh
+++ b/t/t1407-worktree-ref-store.sh
@@ -2,7 +2,7 @@
 
 test_description='test worktree ref store api'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -12,7 +12,7 @@ RMAIN="test-tool ref-store worktree:main"
 
 test_expect_success 'setup' '
 	test_commit first &&
-	git worktree add -b wt-master wt &&
+	git worktree add -b wt-main wt &&
 	(
 		cd wt &&
 		test_commit second
@@ -20,34 +20,34 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'resolve_ref(<shared-ref>)' '
-	SHA1=`git rev-parse master` &&
-	echo "$SHA1 refs/heads/master 0x0" >expected &&
-	$RWT resolve-ref refs/heads/master 0 >actual &&
+	SHA1=`git rev-parse main` &&
+	echo "$SHA1 refs/heads/main 0x0" >expected &&
+	$RWT resolve-ref refs/heads/main 0 >actual &&
 	test_cmp expected actual &&
-	$RMAIN resolve-ref refs/heads/master 0 >actual &&
+	$RMAIN resolve-ref refs/heads/main 0 >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'resolve_ref(<per-worktree-ref>)' '
 	SHA1=`git -C wt rev-parse HEAD` &&
-	echo "$SHA1 refs/heads/wt-master 0x1" >expected &&
+	echo "$SHA1 refs/heads/wt-main 0x1" >expected &&
 	$RWT resolve-ref HEAD 0 >actual &&
 	test_cmp expected actual &&
 
 	SHA1=`git rev-parse HEAD` &&
-	echo "$SHA1 refs/heads/master 0x1" >expected &&
+	echo "$SHA1 refs/heads/main 0x1" >expected &&
 	$RMAIN resolve-ref HEAD 0 >actual &&
 	test_cmp expected actual
 '
 
-test_expect_success 'create_symref(FOO, refs/heads/master)' '
-	$RWT create-symref FOO refs/heads/master nothing &&
-	echo refs/heads/master >expected &&
+test_expect_success 'create_symref(FOO, refs/heads/main)' '
+	$RWT create-symref FOO refs/heads/main nothing &&
+	echo refs/heads/main >expected &&
 	git -C wt symbolic-ref FOO >actual &&
 	test_cmp expected actual &&
 
-	$RMAIN create-symref FOO refs/heads/wt-master nothing &&
-	echo refs/heads/wt-master >expected &&
+	$RMAIN create-symref FOO refs/heads/wt-main nothing &&
+	echo refs/heads/wt-main >expected &&
 	git symbolic-ref FOO >actual &&
 	test_cmp expected actual
 '
@@ -66,8 +66,8 @@ test_expect_success 'for_each_reflog()' '
 	HEAD 0x1
 	PSEUDO-WT 0x0
 	refs/bisect/wt-random 0x0
-	refs/heads/master 0x0
-	refs/heads/wt-master 0x0
+	refs/heads/main 0x0
+	refs/heads/wt-main 0x0
 	EOF
 	test_cmp expected actual &&
 
@@ -76,8 +76,8 @@ test_expect_success 'for_each_reflog()' '
 	HEAD 0x1
 	PSEUDO-MAIN 0x0
 	refs/bisect/random 0x0
-	refs/heads/master 0x0
-	refs/heads/wt-master 0x0
+	refs/heads/main 0x0
+	refs/heads/wt-main 0x0
 	EOF
 	test_cmp expected actual
 '
diff --git a/t/t1408-packed-refs.sh b/t/t1408-packed-refs.sh
index fd58388232..41ba1f1d7f 100755
--- a/t/t1408-packed-refs.sh
+++ b/t/t1408-packed-refs.sh
@@ -2,7 +2,7 @@
 
 test_description='packed-refs entries are covered by loose refs'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -12,32 +12,32 @@ test_expect_success setup '
 	git commit --allow-empty -m one &&
 	one=$(git rev-parse HEAD) &&
 	git for-each-ref >actual &&
-	echo "$one commit	refs/heads/master" >expect &&
+	echo "$one commit	refs/heads/main" >expect &&
 	test_cmp expect actual &&
 
 	git pack-refs --all &&
 	git for-each-ref >actual &&
-	echo "$one commit	refs/heads/master" >expect &&
+	echo "$one commit	refs/heads/main" >expect &&
 	test_cmp expect actual &&
 
 	git checkout --orphan another &&
 	test_tick &&
 	git commit --allow-empty -m two &&
 	two=$(git rev-parse HEAD) &&
-	git checkout -B master &&
+	git checkout -B main &&
 	git branch -D another &&
 
 	git for-each-ref >actual &&
-	echo "$two commit	refs/heads/master" >expect &&
+	echo "$two commit	refs/heads/main" >expect &&
 	test_cmp expect actual &&
 
 	git reflog expire --expire=now --all &&
 	git prune &&
-	git tag -m v1.0 v1.0 master
+	git tag -m v1.0 v1.0 main
 '
 
 test_expect_success 'no error from stale entry in packed-refs' '
-	git describe master >actual 2>&1 &&
+	git describe main >actual 2>&1 &&
 	echo "v1.0" >expect &&
 	test_cmp expect actual
 '
diff --git a/t/t1410-reflog.sh b/t/t1410-reflog.sh
index aa02ca488d..ecccaa0634 100755
--- a/t/t1410-reflog.sh
+++ b/t/t1410-reflog.sh
@@ -4,7 +4,7 @@
 #
 
 test_description='Test prune and reflog expiration'
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -102,7 +102,7 @@ test_expect_success setup '
 
 	check_fsck &&
 
-	git reflog refs/heads/master >output &&
+	git reflog refs/heads/main >output &&
 	test_line_count = 4 output
 '
 
@@ -119,7 +119,7 @@ test_expect_success rewind '
 
 	check_have A B C D E F G H I J K L &&
 
-	git reflog refs/heads/master >output &&
+	git reflog refs/heads/main >output &&
 	test_line_count = 5 output
 '
 
@@ -138,7 +138,7 @@ test_expect_success 'reflog expire --dry-run should not touch reflog' '
 		--stale-fix \
 		--all &&
 
-	git reflog refs/heads/master >output &&
+	git reflog refs/heads/main >output &&
 	test_line_count = 5 output &&
 
 	check_fsck "missing blob $F"
@@ -152,7 +152,7 @@ test_expect_success 'reflog expire' '
 		--stale-fix \
 		--all &&
 
-	git reflog refs/heads/master >output &&
+	git reflog refs/heads/main >output &&
 	test_line_count = 2 output &&
 
 	check_fsck "dangling commit $K"
@@ -189,29 +189,29 @@ test_expect_success 'delete' '
 	git commit -m tiger C &&
 
 	HEAD_entry_count=$(git reflog | wc -l) &&
-	master_entry_count=$(git reflog show master | wc -l) &&
+	main_entry_count=$(git reflog show main | wc -l) &&
 
 	test $HEAD_entry_count = 5 &&
-	test $master_entry_count = 5 &&
+	test $main_entry_count = 5 &&
 
 
-	git reflog delete master@{1} &&
-	git reflog show master > output &&
-	test_line_count = $(($master_entry_count - 1)) output &&
+	git reflog delete main@{1} &&
+	git reflog show main > output &&
+	test_line_count = $(($main_entry_count - 1)) output &&
 	test $HEAD_entry_count = $(git reflog | wc -l) &&
 	! grep ox < output &&
 
-	master_entry_count=$(wc -l < output) &&
+	main_entry_count=$(wc -l < output) &&
 
 	git reflog delete HEAD@{1} &&
 	test $(($HEAD_entry_count -1)) = $(git reflog | wc -l) &&
-	test $master_entry_count = $(git reflog show master | wc -l) &&
+	test $main_entry_count = $(git reflog show main | wc -l) &&
 
 	HEAD_entry_count=$(git reflog | wc -l) &&
 
-	git reflog delete master@{07.04.2005.15:15:00.-0700} &&
-	git reflog show master > output &&
-	test_line_count = $(($master_entry_count - 1)) output &&
+	git reflog delete main@{07.04.2005.15:15:00.-0700} &&
+	git reflog show main > output &&
+	test_line_count = $(($main_entry_count - 1)) output &&
 	! grep dragon < output
 
 '
@@ -219,7 +219,7 @@ test_expect_success 'delete' '
 test_expect_success 'rewind2' '
 
 	test_tick && git reset --hard HEAD~2 &&
-	git reflog refs/heads/master >output &&
+	git reflog refs/heads/main >output &&
 	test_line_count = 4 output
 '
 
@@ -229,7 +229,7 @@ test_expect_success '--expire=never' '
 		--expire=never \
 		--expire-unreachable=never \
 		--all &&
-	git reflog refs/heads/master >output &&
+	git reflog refs/heads/main >output &&
 	test_line_count = 4 output
 '
 
@@ -240,7 +240,7 @@ test_expect_success 'gc.reflogexpire=never' '
 	git reflog expire --verbose --all >output &&
 	test_line_count = 9 output &&
 
-	git reflog refs/heads/master >output &&
+	git reflog refs/heads/main >output &&
 	test_line_count = 4 output
 '
 
@@ -249,7 +249,7 @@ test_expect_success 'gc.reflogexpire=false' '
 	test_config gc.reflogexpireunreachable false &&
 
 	git reflog expire --verbose --all &&
-	git reflog refs/heads/master >output &&
+	git reflog refs/heads/main >output &&
 	test_line_count = 4 output
 
 '
@@ -258,33 +258,33 @@ test_expect_success 'git reflog expire unknown reference' '
 	test_config gc.reflogexpire never &&
 	test_config gc.reflogexpireunreachable never &&
 
-	test_must_fail git reflog expire master@{123} 2>stderr &&
+	test_must_fail git reflog expire main@{123} 2>stderr &&
 	test_i18ngrep "points nowhere" stderr &&
 	test_must_fail git reflog expire does-not-exist 2>stderr &&
 	test_i18ngrep "points nowhere" stderr
 '
 
 test_expect_success 'checkout should not delete log for packed ref' '
-	test $(git reflog master | wc -l) = 4 &&
+	test $(git reflog main | wc -l) = 4 &&
 	git branch foo &&
 	git pack-refs --all &&
 	git checkout foo &&
-	test $(git reflog master | wc -l) = 4
+	test $(git reflog main | wc -l) = 4
 '
 
 test_expect_success 'stale dirs do not cause d/f conflicts (reflogs on)' '
 	test_when_finished "git branch -d one || git branch -d one/two" &&
 
-	git branch one/two master &&
-	echo "one/two@{0} branch: Created from master" >expect &&
+	git branch one/two main &&
+	echo "one/two@{0} branch: Created from main" >expect &&
 	git log -g --format="%gd %gs" one/two >actual &&
 	test_cmp expect actual &&
 	git branch -d one/two &&
 
 	# now logs/refs/heads/one is a stale directory, but
 	# we should move it out of the way to create "one" reflog
-	git branch one master &&
-	echo "one@{0} branch: Created from master" >expect &&
+	git branch one main &&
+	echo "one@{0} branch: Created from main" >expect &&
 	git log -g --format="%gd %gs" one >actual &&
 	test_cmp expect actual
 '
@@ -292,15 +292,15 @@ test_expect_success 'stale dirs do not cause d/f conflicts (reflogs on)' '
 test_expect_success 'stale dirs do not cause d/f conflicts (reflogs off)' '
 	test_when_finished "git branch -d one || git branch -d one/two" &&
 
-	git branch one/two master &&
-	echo "one/two@{0} branch: Created from master" >expect &&
+	git branch one/two main &&
+	echo "one/two@{0} branch: Created from main" >expect &&
 	git log -g --format="%gd %gs" one/two >actual &&
 	test_cmp expect actual &&
 	git branch -d one/two &&
 
 	# same as before, but we only create a reflog for "one" if
 	# it already exists, which it does not
-	git -c core.logallrefupdates=false branch one master &&
+	git -c core.logallrefupdates=false branch one main &&
 	git log -g --format="%gd %gs" one >actual &&
 	test_must_be_empty actual
 '
diff --git a/t/t1411-reflog-show.sh b/t/t1411-reflog-show.sh
index f6fecff671..0bb319b944 100755
--- a/t/t1411-reflog-show.sh
+++ b/t/t1411-reflog-show.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 test_description='Test reflog display routines'
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -170,7 +170,7 @@ test_expect_success 'git log -g -p shows diffs vs. parents' '
 '
 
 test_expect_success 'reflog exists works' '
-	git reflog exists refs/heads/master &&
+	git reflog exists refs/heads/main &&
 	! git reflog exists refs/heads/nonexistent
 '
 
diff --git a/t/t1413-reflog-detach.sh b/t/t1413-reflog-detach.sh
index 140914aa29..bde05208ae 100755
--- a/t/t1413-reflog-detach.sh
+++ b/t/t1413-reflog-detach.sh
@@ -1,13 +1,13 @@
 #!/bin/sh
 
 test_description='Test reflog interaction with detached HEAD'
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
 
 reset_state () {
-	git checkout master &&
+	git checkout main &&
 	cp saved_reflog .git/logs/HEAD
 }
 
@@ -22,14 +22,14 @@ test_expect_success setup '
 
 test_expect_success baseline '
 	reset_state &&
-	git rev-parse master master^ >expect &&
+	git rev-parse main main^ >expect &&
 	git log -g --format=%H >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'switch to branch' '
 	reset_state &&
-	git rev-parse side master master^ >expect &&
+	git rev-parse side main main^ >expect &&
 	git checkout side &&
 	git log -g --format=%H >actual &&
 	test_cmp expect actual
@@ -37,34 +37,34 @@ test_expect_success 'switch to branch' '
 
 test_expect_success 'detach to other' '
 	reset_state &&
-	git rev-parse master side master master^ >expect &&
+	git rev-parse main side main main^ >expect &&
 	git checkout side &&
-	git checkout master^0 &&
+	git checkout main^0 &&
 	git log -g --format=%H >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'detach to self' '
 	reset_state &&
-	git rev-parse master master master^ >expect &&
-	git checkout master^0 &&
+	git rev-parse main main main^ >expect &&
+	git checkout main^0 &&
 	git log -g --format=%H >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'attach to self' '
 	reset_state &&
-	git rev-parse master master master master^ >expect &&
-	git checkout master^0 &&
-	git checkout master &&
+	git rev-parse main main main main^ >expect &&
+	git checkout main^0 &&
+	git checkout main &&
 	git log -g --format=%H >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'attach to other' '
 	reset_state &&
-	git rev-parse side master master master^ >expect &&
-	git checkout master^0 &&
+	git rev-parse side main main main^ >expect &&
+	git checkout main^0 &&
 	git checkout side &&
 	git log -g --format=%H >actual &&
 	test_cmp expect actual
diff --git a/t/t1414-reflog-walk.sh b/t/t1414-reflog-walk.sh
index c463b5fc29..80d94704d0 100755
--- a/t/t1414-reflog-walk.sh
+++ b/t/t1414-reflog-walk.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 test_description='various tests of reflog walk (log -g) behavior'
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -11,7 +11,7 @@ test_expect_success 'set up some reflog entries' '
 	test_commit two &&
 	git checkout -b side HEAD^ &&
 	test_commit three &&
-	git merge --no-commit master &&
+	git merge --no-commit main &&
 	echo evil-merge-content >>one.t &&
 	test_tick &&
 	git commit --no-edit -a
@@ -23,9 +23,9 @@ do_walk () {
 
 test_expect_success 'set up expected reflog' '
 	cat >expect.all <<-EOF
-	HEAD@{0} commit (merge): Merge branch ${SQ}master${SQ} into side
+	HEAD@{0} commit (merge): Merge branch ${SQ}main${SQ} into side
 	HEAD@{1} commit: three
-	HEAD@{2} checkout: moving from master to side
+	HEAD@{2} checkout: moving from main to side
 	HEAD@{3} commit: two
 	HEAD@{4} commit (initial): one
 	EOF
@@ -76,15 +76,15 @@ test_expect_success 'walking multiple reflogs shows all' '
 	#      sort ignores the bits after the timestamp.
 	#
 	#   2. POSIX leaves undefined whether this is a stable sort or not. So
-	#      we use "-k 1" to ensure that we see HEAD before master before
+	#      we use "-k 1" to ensure that we see HEAD before main before
 	#      side when breaking ties.
 	{
 		do_walk --date=unix HEAD &&
 		do_walk --date=unix side &&
-		do_walk --date=unix master
+		do_walk --date=unix main
 	} >expect.raw &&
 	sort -t "{" -k 2nr -k 1 <expect.raw >expect &&
-	do_walk --date=unix HEAD master side >actual &&
+	do_walk --date=unix HEAD main side >actual &&
 	test_cmp expect actual
 '
 
diff --git a/t/t1416-ref-transaction-hooks.sh b/t/t1416-ref-transaction-hooks.sh
index a26a6b782d..6c941027a8 100755
--- a/t/t1416-ref-transaction-hooks.sh
+++ b/t/t1416-ref-transaction-hooks.sh
@@ -2,7 +2,7 @@
 
 test_description='reference transaction hooks'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -56,11 +56,11 @@ test_expect_success 'hook gets all queued updates in prepared state' '
 	EOF
 	cat >expect <<-EOF &&
 		$ZERO_OID $POST_OID HEAD
-		$ZERO_OID $POST_OID refs/heads/master
+		$ZERO_OID $POST_OID refs/heads/main
 	EOF
 	git update-ref HEAD POST <<-EOF &&
 		update HEAD $ZERO_OID $POST_OID
-		update refs/heads/master $ZERO_OID $POST_OID
+		update refs/heads/main $ZERO_OID $POST_OID
 	EOF
 	test_cmp expect actual
 '
@@ -79,7 +79,7 @@ test_expect_success 'hook gets all queued updates in committed state' '
 	EOF
 	cat >expect <<-EOF &&
 		$ZERO_OID $POST_OID HEAD
-		$ZERO_OID $POST_OID refs/heads/master
+		$ZERO_OID $POST_OID refs/heads/main
 	EOF
 	git update-ref HEAD POST &&
 	test_cmp expect actual
@@ -99,12 +99,12 @@ test_expect_success 'hook gets all queued updates in aborted state' '
 	EOF
 	cat >expect <<-EOF &&
 		$ZERO_OID $POST_OID HEAD
-		$ZERO_OID $POST_OID refs/heads/master
+		$ZERO_OID $POST_OID refs/heads/main
 	EOF
 	git update-ref --stdin <<-EOF &&
 		start
 		update HEAD POST $ZERO_OID
-		update refs/heads/master POST $ZERO_OID
+		update refs/heads/main POST $ZERO_OID
 		abort
 	EOF
 	test_cmp expect actual
diff --git a/t/t1430-bad-ref-name.sh b/t/t1430-bad-ref-name.sh
index 8c4353746b..354902e514 100755
--- a/t/t1430-bad-ref-name.sh
+++ b/t/t1430-bad-ref-name.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 test_description='Test handling of ref names that check-ref-format rejects'
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -20,7 +20,7 @@ test_expect_success 'fast-import: fail on invalid branch name ".badbranchname"'
 		corrupt
 		COMMIT
 
-		from refs/heads/master
+		from refs/heads/main
 
 	INPUT_END
 	test_must_fail git fast-import <input
@@ -35,14 +35,14 @@ test_expect_success 'fast-import: fail on invalid branch name "bad[branch]name"'
 		corrupt
 		COMMIT
 
-		from refs/heads/master
+		from refs/heads/main
 
 	INPUT_END
 	test_must_fail git fast-import <input
 '
 
 test_expect_success 'git branch shows badly named ref as warning' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
+	cp .git/refs/heads/main .git/refs/heads/broken...ref &&
 	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
 	git branch >output 2>error &&
 	test_i18ngrep -e "ignoring ref with broken name refs/heads/broken\.\.\.ref" error &&
@@ -50,7 +50,7 @@ test_expect_success 'git branch shows badly named ref as warning' '
 '
 
 test_expect_success 'branch -d can delete badly named ref' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
+	cp .git/refs/heads/main .git/refs/heads/broken...ref &&
 	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
 	git branch -d broken...ref &&
 	git branch >output 2>error &&
@@ -59,7 +59,7 @@ test_expect_success 'branch -d can delete badly named ref' '
 '
 
 test_expect_success 'branch -D can delete badly named ref' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
+	cp .git/refs/heads/main .git/refs/heads/broken...ref &&
 	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
 	git branch -D broken...ref &&
 	git branch >output 2>error &&
@@ -101,17 +101,17 @@ test_expect_success 'branch -m cannot rename to a bad ref name' '
 	test_might_fail git branch -D goodref &&
 	git branch goodref &&
 	test_must_fail git branch -m goodref broken...ref &&
-	test_cmp_rev master goodref &&
+	test_cmp_rev main goodref &&
 	git branch >output 2>error &&
 	! grep -e "broken\.\.\.ref" error &&
 	! grep -e "broken\.\.\.ref" output
 '
 
 test_expect_failure 'branch -m can rename from a bad ref name' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
+	cp .git/refs/heads/main .git/refs/heads/broken...ref &&
 	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
 	git branch -m broken...ref renamed &&
-	test_cmp_rev master renamed &&
+	test_cmp_rev main renamed &&
 	git branch >output 2>error &&
 	! grep -e "broken\.\.\.ref" error &&
 	! grep -e "broken\.\.\.ref" output
@@ -138,7 +138,7 @@ test_expect_failure C_LOCALE_OUTPUT 'push --mirror can delete badly named ref' '
 		cd dest &&
 		test_commit two &&
 		git checkout --detach &&
-		cp .git/refs/heads/master .git/refs/heads/broken...ref
+		cp .git/refs/heads/main .git/refs/heads/broken...ref
 	) &&
 	git -C src push --mirror "file://$top/dest" &&
 	git -C dest branch >output 2>error &&
@@ -149,7 +149,7 @@ test_expect_failure C_LOCALE_OUTPUT 'push --mirror can delete badly named ref' '
 test_expect_success 'rev-parse skips symref pointing to broken name' '
 	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
 	git branch shadow one &&
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
+	cp .git/refs/heads/main .git/refs/heads/broken...ref &&
 	printf "ref: refs/heads/broken...ref\n" >.git/refs/tags/shadow &&
 	test_when_finished "rm -f .git/refs/tags/shadow" &&
 	git rev-parse --verify one >expect &&
@@ -159,11 +159,11 @@ test_expect_success 'rev-parse skips symref pointing to broken name' '
 '
 
 test_expect_success 'for-each-ref emits warnings for broken names' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
+	cp .git/refs/heads/main .git/refs/heads/broken...ref &&
 	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
 	printf "ref: refs/heads/broken...ref\n" >.git/refs/heads/badname &&
 	test_when_finished "rm -f .git/refs/heads/badname" &&
-	printf "ref: refs/heads/master\n" >.git/refs/heads/broken...symref &&
+	printf "ref: refs/heads/main\n" >.git/refs/heads/broken...symref &&
 	test_when_finished "rm -f .git/refs/heads/broken...symref" &&
 	git for-each-ref >output 2>error &&
 	! grep -e "broken\.\.\.ref" output &&
@@ -175,7 +175,7 @@ test_expect_success 'for-each-ref emits warnings for broken names' '
 '
 
 test_expect_success 'update-ref -d can delete broken name' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
+	cp .git/refs/heads/main .git/refs/heads/broken...ref &&
 	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
 	git update-ref -d refs/heads/broken...ref >output 2>error &&
 	test_must_be_empty output &&
@@ -186,7 +186,7 @@ test_expect_success 'update-ref -d can delete broken name' '
 '
 
 test_expect_success 'branch -d can delete broken name' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
+	cp .git/refs/heads/main .git/refs/heads/broken...ref &&
 	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
 	git branch -d broken...ref >output 2>error &&
 	test_i18ngrep "Deleted branch broken...ref (was broken)" output &&
@@ -197,7 +197,7 @@ test_expect_success 'branch -d can delete broken name' '
 '
 
 test_expect_success 'update-ref --no-deref -d can delete symref to broken name' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
+	cp .git/refs/heads/main .git/refs/heads/broken...ref &&
 	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
 	printf "ref: refs/heads/broken...ref\n" >.git/refs/heads/badname &&
 	test_when_finished "rm -f .git/refs/heads/badname" &&
@@ -208,7 +208,7 @@ test_expect_success 'update-ref --no-deref -d can delete symref to broken name'
 '
 
 test_expect_success 'branch -d can delete symref to broken name' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
+	cp .git/refs/heads/main .git/refs/heads/broken...ref &&
 	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
 	printf "ref: refs/heads/broken...ref\n" >.git/refs/heads/badname &&
 	test_when_finished "rm -f .git/refs/heads/badname" &&
@@ -237,7 +237,7 @@ test_expect_success 'branch -d can delete dangling symref to broken name' '
 '
 
 test_expect_success 'update-ref -d can delete broken name through symref' '
-	cp .git/refs/heads/master .git/refs/heads/broken...ref &&
+	cp .git/refs/heads/main .git/refs/heads/broken...ref &&
 	test_when_finished "rm -f .git/refs/heads/broken...ref" &&
 	printf "ref: refs/heads/broken...ref\n" >.git/refs/heads/badname &&
 	test_when_finished "rm -f .git/refs/heads/badname" &&
@@ -248,7 +248,7 @@ test_expect_success 'update-ref -d can delete broken name through symref' '
 '
 
 test_expect_success 'update-ref --no-deref -d can delete symref with broken name' '
-	printf "ref: refs/heads/master\n" >.git/refs/heads/broken...symref &&
+	printf "ref: refs/heads/main\n" >.git/refs/heads/broken...symref &&
 	test_when_finished "rm -f .git/refs/heads/broken...symref" &&
 	git update-ref --no-deref -d refs/heads/broken...symref >output 2>error &&
 	test_path_is_missing .git/refs/heads/broken...symref &&
@@ -257,11 +257,11 @@ test_expect_success 'update-ref --no-deref -d can delete symref with broken name
 '
 
 test_expect_success 'branch -d can delete symref with broken name' '
-	printf "ref: refs/heads/master\n" >.git/refs/heads/broken...symref &&
+	printf "ref: refs/heads/main\n" >.git/refs/heads/broken...symref &&
 	test_when_finished "rm -f .git/refs/heads/broken...symref" &&
 	git branch -d broken...symref >output 2>error &&
 	test_path_is_missing .git/refs/heads/broken...symref &&
-	test_i18ngrep "Deleted branch broken...symref (was refs/heads/master)" output &&
+	test_i18ngrep "Deleted branch broken...symref (was refs/heads/main)" output &&
 	test_must_be_empty error
 '
 
@@ -299,37 +299,37 @@ test_expect_success 'update-ref -d cannot delete absolute path' '
 '
 
 test_expect_success 'update-ref --stdin fails create with bad ref name' '
-	echo "create ~a refs/heads/master" >stdin &&
+	echo "create ~a refs/heads/main" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
 	grep "fatal: invalid ref format: ~a" err
 '
 
 test_expect_success 'update-ref --stdin fails update with bad ref name' '
-	echo "update ~a refs/heads/master" >stdin &&
+	echo "update ~a refs/heads/main" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
 	grep "fatal: invalid ref format: ~a" err
 '
 
 test_expect_success 'update-ref --stdin fails delete with bad ref name' '
-	echo "delete ~a refs/heads/master" >stdin &&
+	echo "delete ~a refs/heads/main" >stdin &&
 	test_must_fail git update-ref --stdin <stdin 2>err &&
 	grep "fatal: invalid ref format: ~a" err
 '
 
 test_expect_success 'update-ref --stdin -z fails create with bad ref name' '
-	printf "%s\0" "create ~a " refs/heads/master >stdin &&
+	printf "%s\0" "create ~a " refs/heads/main >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
 	grep "fatal: invalid ref format: ~a " err
 '
 
 test_expect_success 'update-ref --stdin -z fails update with bad ref name' '
-	printf "%s\0" "update ~a" refs/heads/master "" >stdin &&
+	printf "%s\0" "update ~a" refs/heads/main "" >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
 	grep "fatal: invalid ref format: ~a" err
 '
 
 test_expect_success 'update-ref --stdin -z fails delete with bad ref name' '
-	printf "%s\0" "delete ~a" refs/heads/master >stdin &&
+	printf "%s\0" "delete ~a" refs/heads/main >stdin &&
 	test_must_fail git update-ref -z --stdin <stdin 2>err &&
 	grep "fatal: invalid ref format: ~a" err
 '
diff --git a/t/t1450-fsck.sh b/t/t1450-fsck.sh
index b17f5c21fb..a30fc5f74a 100755
--- a/t/t1450-fsck.sh
+++ b/t/t1450-fsck.sh
@@ -3,7 +3,7 @@
 test_description='git fsck random collection of tests
 
 * (HEAD) B
-* (master) A
+* (main) A
 '
 
 . ./test-lib.sh
diff --git a/t/t1500-rev-parse.sh b/t/t1500-rev-parse.sh
index d23da4e8de..9e911e0054 100755
--- a/t/t1500-rev-parse.sh
+++ b/t/t1500-rev-parse.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 test_description='test git rev-parse'
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -177,8 +177,8 @@ test_expect_success 'showing the superproject correctly' '
 	test_commit -C super/dir/sub branch1_commit &&
 	git -C super add dir/sub &&
 	test_commit -C super branch1_commit &&
-	git -C super checkout -b branch2 master &&
-	git -C super/dir/sub checkout -b branch2 master &&
+	git -C super checkout -b branch2 main &&
+	git -C super/dir/sub checkout -b branch2 main &&
 	test_commit -C super/dir/sub branch2_commit &&
 	git -C super add dir/sub &&
 	test_commit -C super branch2_commit &&
diff --git a/t/t1503-rev-parse-verify.sh b/t/t1503-rev-parse-verify.sh
index e4343c49b2..a3d6877588 100755
--- a/t/t1503-rev-parse-verify.sh
+++ b/t/t1503-rev-parse-verify.sh
@@ -6,7 +6,7 @@ test_description='test git rev-parse --verify'
 
 exec </dev/null
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -54,8 +54,8 @@ test_expect_success 'works with one good rev' '
 	test "$rev_hash3" = "$HASH3" &&
 	rev_hash4=$(git rev-parse --verify $HASH4) &&
 	test "$rev_hash4" = "$HASH4" &&
-	rev_master=$(git rev-parse --verify master) &&
-	test "$rev_master" = "$HASH4" &&
+	rev_main=$(git rev-parse --verify main) &&
+	test "$rev_main" = "$HASH4" &&
 	rev_head=$(git rev-parse --verify HEAD) &&
 	test "$rev_head" = "$HASH4"
 '
@@ -119,27 +119,27 @@ test_expect_success 'no stdout output on error' '
 '
 
 test_expect_success 'use --default' '
-	git rev-parse --verify --default master &&
-	git rev-parse --verify --default master HEAD &&
-	git rev-parse --default master --verify &&
-	git rev-parse --default master --verify HEAD &&
-	git rev-parse --verify HEAD --default master &&
-	test_must_fail git rev-parse --verify foo --default master &&
+	git rev-parse --verify --default main &&
+	git rev-parse --verify --default main HEAD &&
+	git rev-parse --default main --verify &&
+	git rev-parse --default main --verify HEAD &&
+	git rev-parse --verify HEAD --default main &&
+	test_must_fail git rev-parse --verify foo --default main &&
 	test_must_fail git rev-parse --default HEAD --verify bar &&
 	test_must_fail git rev-parse --verify --default HEAD baz &&
 	test_must_fail git rev-parse --default foo --verify &&
 	test_must_fail git rev-parse --verify --default bar
 '
 
-test_expect_success 'master@{n} for various n' '
+test_expect_success 'main@{n} for various n' '
 	N=$(git reflog | wc -l) &&
 	Nm1=$(($N-1)) &&
 	Np1=$(($N+1)) &&
-	git rev-parse --verify master@{0} &&
-	git rev-parse --verify master@{1} &&
-	git rev-parse --verify master@{$Nm1} &&
-	test_must_fail git rev-parse --verify master@{$N} &&
-	test_must_fail git rev-parse --verify master@{$Np1}
+	git rev-parse --verify main@{0} &&
+	git rev-parse --verify main@{1} &&
+	git rev-parse --verify main@{$Nm1} &&
+	test_must_fail git rev-parse --verify main@{$N} &&
+	test_must_fail git rev-parse --verify main@{$Np1}
 '
 
 test_expect_success SYMLINKS 'ref resolution not confused by broken symlinks' '
diff --git a/t/t1505-rev-parse-last.sh b/t/t1505-rev-parse-last.sh
index 9bd0307b5d..2803ca9489 100755
--- a/t/t1505-rev-parse-last.sh
+++ b/t/t1505-rev-parse-last.sh
@@ -2,7 +2,7 @@
 
 test_description='test @{-N} syntax'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -23,12 +23,12 @@ test_expect_success 'setup' '
 	make_commit 3 &&
 	git checkout side &&
 	make_commit 4 &&
-	git merge master &&
-	git checkout master
+	git merge main &&
+	git checkout main
 
 '
 
-# 1 -- 2 -- 3 master
+# 1 -- 2 -- 3 main
 #  \         \
 #   \         \
 #    --- 4 --- 5 side
@@ -52,7 +52,7 @@ test_expect_success '@{-1}@{1} works' '
 '
 
 test_expect_success '@{-2} works' '
-	test_cmp_rev master @{-2}
+	test_cmp_rev main @{-2}
 '
 
 test_expect_success '@{-3} fails' '
diff --git a/t/t1506-rev-parse-diagnosis.sh b/t/t1506-rev-parse-diagnosis.sh
index 694d74fc01..f6e6f23f7e 100755
--- a/t/t1506-rev-parse-diagnosis.sh
+++ b/t/t1506-rev-parse-diagnosis.sh
@@ -4,7 +4,7 @@ test_description='test git rev-parse diagnosis for invalid argument'
 
 exec </dev/null
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -140,10 +140,10 @@ test_expect_success 'incorrect file in :path and :N:path' '
 '
 
 test_expect_success 'invalid @{n} reference' '
-	test_must_fail git rev-parse master@{99999} >output 2>error &&
+	test_must_fail git rev-parse main@{99999} >output 2>error &&
 	test_must_be_empty output &&
 	test_i18ngrep "log for [^ ]* only has [0-9][0-9]* entries" error  &&
-	test_must_fail git rev-parse --verify master@{99999} >output 2>error &&
+	test_must_fail git rev-parse --verify main@{99999} >output 2>error &&
 	test_must_be_empty output &&
 	test_i18ngrep "log for [^ ]* only has [0-9][0-9]* entries" error
 '
diff --git a/t/t1507-rev-parse-upstream.sh b/t/t1507-rev-parse-upstream.sh
index 521233a3c3..73b4f34c6e 100755
--- a/t/t1507-rev-parse-upstream.sh
+++ b/t/t1507-rev-parse-upstream.sh
@@ -2,7 +2,7 @@
 
 test_description='test <branch>@{upstream} syntax'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -13,20 +13,20 @@ test_expect_success 'setup' '
 	test_commit 1 &&
 	git checkout -b side &&
 	test_commit 2 &&
-	git checkout master &&
+	git checkout main &&
 	git clone . clone &&
 	test_commit 3 &&
 	(cd clone &&
 	 test_commit 4 &&
 	 git branch --track my-side origin/side &&
-	 git branch --track local-master master &&
+	 git branch --track local-main main &&
 	 git branch --track fun@ny origin/side &&
 	 git branch --track @funny origin/side &&
 	 git branch --track funny@ origin/side &&
-	 git remote add -t master master-only .. &&
-	 git fetch master-only &&
+	 git remote add -t main main-only .. &&
+	 git fetch main-only &&
 	 git branch bad-upstream &&
-	 git config branch.bad-upstream.remote master-only &&
+	 git config branch.bad-upstream.remote main-only &&
 	 git config branch.bad-upstream.merge refs/heads/side
 	)
 '
@@ -42,7 +42,7 @@ error_message () {
 }
 
 test_expect_success '@{upstream} resolves to correct full name' '
-	echo refs/remotes/origin/master >expect &&
+	echo refs/remotes/origin/main >expect &&
 	git -C clone rev-parse --symbolic-full-name @{upstream} >actual &&
 	test_cmp expect actual &&
 	git -C clone rev-parse --symbolic-full-name @{UPSTREAM} >actual &&
@@ -52,7 +52,7 @@ test_expect_success '@{upstream} resolves to correct full name' '
 '
 
 test_expect_success '@{u} resolves to correct full name' '
-	echo refs/remotes/origin/master >expect &&
+	echo refs/remotes/origin/main >expect &&
 	git -C clone rev-parse --symbolic-full-name @{u} >actual &&
 	test_cmp expect actual &&
 	git -C clone rev-parse --symbolic-full-name @{U} >actual &&
@@ -135,7 +135,7 @@ test_expect_success 'checkout -b new my-side@{u} forks from the same' '
 test_expect_success 'merge my-side@{u} records the correct name' '
 (
 	cd clone &&
-	git checkout master &&
+	git checkout main &&
 	test_might_fail git branch -D new &&
 	git branch -t new my-side@{u} &&
 	git merge -s ours new@{u} &&
@@ -146,24 +146,24 @@ test_expect_success 'merge my-side@{u} records the correct name' '
 '
 
 test_expect_success 'branch -d other@{u}' '
-	git checkout -t -b other master &&
+	git checkout -t -b other main &&
 	git branch -d @{u} &&
-	git for-each-ref refs/heads/master >actual &&
+	git for-each-ref refs/heads/main >actual &&
 	test_must_be_empty actual
 '
 
 test_expect_success 'checkout other@{u}' '
-	git branch -f master HEAD &&
-	git checkout -t -b another master &&
+	git branch -f main HEAD &&
+	git checkout -t -b another main &&
 	git checkout @{u} &&
 	git symbolic-ref HEAD >actual &&
-	echo refs/heads/master >expect &&
+	echo refs/heads/main >expect &&
 	test_cmp expect actual
 '
 
 test_expect_success 'branch@{u} works when tracking a local branch' '
-	echo refs/heads/master >expect &&
-	git -C clone rev-parse --symbolic-full-name local-master@{u} >actual &&
+	echo refs/heads/main >expect &&
+	git -C clone rev-parse --symbolic-full-name local-main@{u} >actual &&
 	test_cmp expect actual
 '
 
@@ -177,7 +177,7 @@ test_expect_success 'branch@{u} error message when no upstream' '
 
 test_expect_success '@{u} error message when no upstream' '
 	cat >expect <<-EOF &&
-	fatal: no upstream configured for branch ${SQ}master${SQ}
+	fatal: no upstream configured for branch ${SQ}main${SQ}
 	EOF
 	test_must_fail git rev-parse --verify @{u} 2>actual &&
 	test_i18ncmp expect actual
@@ -211,14 +211,14 @@ test_expect_success 'branch@{u} error message if upstream branch not fetched' '
 test_expect_success 'pull works when tracking a local branch' '
 (
 	cd clone &&
-	git checkout local-master &&
+	git checkout local-main &&
 	git pull
 )
 '
 
 # makes sense if the previous one succeeded
 test_expect_success '@{u} works when tracking a local branch' '
-	echo refs/heads/master >expect &&
+	echo refs/heads/main >expect &&
 	git -C clone rev-parse --symbolic-full-name @{u} >actual &&
 	test_cmp expect actual
 '
@@ -227,7 +227,7 @@ test_expect_success 'log -g other@{u}' '
 	commit=$(git rev-parse HEAD) &&
 	cat >expect <<-EOF &&
 	commit $commit
-	Reflog: master@{0} (C O Mitter <committer@example.com>)
+	Reflog: main@{0} (C O Mitter <committer@example.com>)
 	Reflog message: branch: Created from HEAD
 	Author: A U Thor <author@example.com>
 	Date:   Thu Apr 7 15:15:13 2005 -0700
@@ -242,7 +242,7 @@ test_expect_success 'log -g other@{u}@{now}' '
 	commit=$(git rev-parse HEAD) &&
 	cat >expect <<-EOF &&
 	commit $commit
-	Reflog: master@{Thu Apr 7 15:17:13 2005 -0700} (C O Mitter <committer@example.com>)
+	Reflog: main@{Thu Apr 7 15:17:13 2005 -0700} (C O Mitter <committer@example.com>)
 	Reflog message: branch: Created from HEAD
 	Author: A U Thor <author@example.com>
 	Date:   Thu Apr 7 15:15:13 2005 -0700
diff --git a/t/t1508-at-combinations.sh b/t/t1508-at-combinations.sh
index 8e73633761..17421a368d 100755
--- a/t/t1508-at-combinations.sh
+++ b/t/t1508-at-combinations.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 test_description='test various @{X} syntax combinations together'
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -33,8 +33,8 @@ fail() {
 }
 
 test_expect_success 'setup' '
-	test_commit master-one &&
-	test_commit master-two &&
+	test_commit main-one &&
+	test_commit main-two &&
 	git checkout -b upstream-branch &&
 	test_commit upstream-one &&
 	test_commit upstream-two &&
@@ -50,7 +50,7 @@ test_expect_success 'setup' '
 	git checkout -b new-branch &&
 	test_commit new-one &&
 	test_commit new-two &&
-	git branch -u master old-branch &&
+	git branch -u main old-branch &&
 	git branch -u upstream-branch new-branch
 '
 
@@ -65,8 +65,8 @@ check "@{-1}@{1}" commit old-one
 check "@{u}" ref refs/heads/upstream-branch
 check "HEAD@{u}" ref refs/heads/upstream-branch
 check "@{u}@{1}" commit upstream-one
-check "@{-1}@{u}" ref refs/heads/master
-check "@{-1}@{u}@{1}" commit master-one
+check "@{-1}@{u}" ref refs/heads/main
+check "@{-1}@{u}@{1}" commit main-one
 check "@" commit new-two
 check "@@{u}" ref refs/heads/upstream-branch
 check "@@/at-test" ref refs/heads/@@/at-test
diff --git a/t/t1511-rev-parse-caret.sh b/t/t1511-rev-parse-caret.sh
index cfb2ea5e04..6ecfed86bc 100755
--- a/t/t1511-rev-parse-caret.sh
+++ b/t/t1511-rev-parse-caret.sh
@@ -2,7 +2,7 @@
 
 test_description='tests for ref^{stuff}'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -18,7 +18,7 @@ test_expect_success 'setup' '
 	git commit -m Initial &&
 	git tag -a -m commit commit-tag &&
 	git branch ref &&
-	git checkout master &&
+	git checkout main &&
 	echo modified >>a-blob &&
 	git add -u &&
 	git commit -m Modified &&
@@ -76,52 +76,52 @@ test_expect_success 'ref^{tag}' '
 '
 
 test_expect_success 'ref^{/.}' '
-	git rev-parse master >expected &&
-	git rev-parse master^{/.} >actual &&
+	git rev-parse main >expected &&
+	git rev-parse main^{/.} >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'ref^{/non-existent}' '
-	test_must_fail git rev-parse master^{/non-existent}
+	test_must_fail git rev-parse main^{/non-existent}
 '
 
 test_expect_success 'ref^{/Initial}' '
 	git rev-parse ref >expected &&
-	git rev-parse master^{/Initial} >actual &&
+	git rev-parse main^{/Initial} >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'ref^{/!Exp}' '
-	test_must_fail git rev-parse master^{/!Exp}
+	test_must_fail git rev-parse main^{/!Exp}
 '
 
 test_expect_success 'ref^{/!}' '
-	test_must_fail git rev-parse master^{/!}
+	test_must_fail git rev-parse main^{/!}
 '
 
 test_expect_success 'ref^{/!!Exp}' '
 	git rev-parse expref >expected &&
-	git rev-parse master^{/!!Exp} >actual &&
+	git rev-parse main^{/!!Exp} >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'ref^{/!-}' '
-	test_must_fail git rev-parse master^{/!-}
+	test_must_fail git rev-parse main^{/!-}
 '
 
 test_expect_success 'ref^{/!-.}' '
-	test_must_fail git rev-parse master^{/!-.}
+	test_must_fail git rev-parse main^{/!-.}
 '
 
 test_expect_success 'ref^{/!-non-existent}' '
-	git rev-parse master >expected &&
-	git rev-parse master^{/!-non-existent} >actual &&
+	git rev-parse main >expected &&
+	git rev-parse main^{/!-non-existent} >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'ref^{/!-Changed}' '
 	git rev-parse expref >expected &&
-	git rev-parse master^{/!-Changed} >actual &&
+	git rev-parse main^{/!-Changed} >actual &&
 	test_cmp expected actual
 '
 
diff --git a/t/t1512-rev-parse-disambiguation.sh b/t/t1512-rev-parse-disambiguation.sh
index 2ef1f2b7e8..b70c9dbce8 100755
--- a/t/t1512-rev-parse-disambiguation.sh
+++ b/t/t1512-rev-parse-disambiguation.sh
@@ -20,7 +20,7 @@ one tagged as v1.0.0.  They all have one regular file each.
 
 '
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -215,7 +215,7 @@ test_expect_success 'more history' '
 	side=$(git rev-parse HEAD) &&
 
 	# commit 000000000066
-	git checkout master &&
+	git checkout main &&
 
 	# If you use recursive, merge will fail and you will need to
 	# clean up a0blgqsjc as well.  If you use resolve, merge will
diff --git a/t/t1513-rev-parse-prefix.sh b/t/t1513-rev-parse-prefix.sh
index d151ef9218..5f437be8c9 100755
--- a/t/t1513-rev-parse-prefix.sh
+++ b/t/t1513-rev-parse-prefix.sh
@@ -2,7 +2,7 @@
 
 test_description='Tests for rev-parse --prefix'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -79,9 +79,9 @@ test_expect_success 'disambiguate path with valid prefix' '
 '
 
 test_expect_success 'file and refs with prefix' '
-	git rev-parse --prefix sub1/ master file1 >actual &&
+	git rev-parse --prefix sub1/ main file1 >actual &&
 	cat <<-EOF >expected &&
-	$(git rev-parse master)
+	$(git rev-parse main)
 	sub1/file1
 	EOF
 	test_cmp expected actual
diff --git a/t/t1514-rev-parse-push.sh b/t/t1514-rev-parse-push.sh
index 173ba2792b..d868a08110 100755
--- a/t/t1514-rev-parse-push.sh
+++ b/t/t1514-rev-parse-push.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 test_description='test <branch>@{push} syntax'
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -19,24 +19,24 @@ test_expect_success 'setup' '
 	git remote add other other.git &&
 	test_commit base &&
 	git push origin HEAD &&
-	git branch --set-upstream-to=origin/master master &&
-	git branch --track topic origin/master &&
+	git branch --set-upstream-to=origin/main main &&
+	git branch --track topic origin/main &&
 	git push origin topic &&
 	git push other topic
 '
 
 test_expect_success '@{push} with default=nothing' '
 	test_config push.default nothing &&
-	test_must_fail git rev-parse master@{push} &&
-	test_must_fail git rev-parse master@{PUSH} &&
-	test_must_fail git rev-parse master@{PuSH}
+	test_must_fail git rev-parse main@{push} &&
+	test_must_fail git rev-parse main@{PUSH} &&
+	test_must_fail git rev-parse main@{PuSH}
 '
 
 test_expect_success '@{push} with default=simple' '
 	test_config push.default simple &&
-	resolve master@{push} refs/remotes/origin/master &&
-	resolve master@{PUSH} refs/remotes/origin/master &&
-	resolve master@{pUSh} refs/remotes/origin/master
+	resolve main@{push} refs/remotes/origin/main &&
+	resolve main@{PUSH} refs/remotes/origin/main &&
+	resolve main@{pUSh} refs/remotes/origin/main
 '
 
 test_expect_success 'triangular @{push} fails with default=simple' '
diff --git a/t/t1700-split-index.sh b/t/t1700-split-index.sh
index 7d4a6f1e93..986baa612e 100755
--- a/t/t1700-split-index.sh
+++ b/t/t1700-split-index.sh
@@ -2,7 +2,7 @@
 
 test_description='split index mode tests'
 
-GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
@@ -499,7 +499,7 @@ test_expect_success 'do not refresh null base index' '
 		test_commit initial &&
 		git checkout -b side-branch &&
 		test_commit extra &&
-		git checkout master &&
+		git checkout main &&
 		git update-index --split-index &&
 		test_commit more &&
 		# must not write a new shareindex, or we wont catch the problem
