diff --git a/Documentation/git-maintenance.txt b/Documentation/git-maintenance.txt
index 898aff4726..1bd105918f 100644
--- a/Documentation/git-maintenance.txt
+++ b/Documentation/git-maintenance.txt
@@ -91,6 +91,21 @@ loose-objects::
 	thousand objects to prevent the job from taking too long on a
 	repository with many loose objects.
 
+incremental-repack::
+	The `incremental-repack` job repacks the object directory
+	using the `multi-pack-index` feature. In order to prevent race
+	conditions with concurrent Git commands, it follows a two-step
+	process. First, it deletes any pack-files included in the
+	`multi-pack-index` where none of the objects in the
+	`multi-pack-index` reference those pack-files; this only happens
+	if all objects in the pack-file are also stored in a newer
+	pack-file. Second, it selects a group of pack-files whose "expected
+	size" is below the batch size until the group has total expected
+	size at least the batch size; see the `--batch-size` option for
+	the `repack` subcommand in linkgit:git-multi-pack-index[1]. The
+	default batch-size is zero, which is a special case that attempts
+	to repack all pack-files into a single pack-file.
+
 OPTIONS
 -------
 --auto::
diff --git a/builtin/gc.c b/builtin/gc.c
index 23329b5652..35c6d7ce82 100644
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -30,6 +30,7 @@
 #include "promisor-remote.h"
 #include "refs.h"
 #include "remote.h"
+#include "midx.h"
 
 #define FAILED_RUN "failed to run %s"
 
@@ -1029,6 +1030,113 @@ static int maintenance_task_loose_objects(struct maintenance_opts *opts)
 	return prune_packed(opts) || pack_loose(opts);
 }
 
+static int multi_pack_index_write(struct maintenance_opts *opts)
+{
+	struct child_process child = CHILD_PROCESS_INIT;
+
+	child.git_cmd = 1;
+	strvec_pushl(&child.args, "multi-pack-index", "write", NULL);
+
+	if (opts->quiet)
+		strvec_push(&child.args, "--no-progress");
+
+	if (run_command(&child))
+		return error(_("failed to write multi-pack-index"));
+
+	return 0;
+}
+
+static int rewrite_multi_pack_index(struct maintenance_opts *opts)
+{
+	struct repository *r = the_repository;
+	char *midx_name = get_midx_filename(r->objects->odb->path);
+
+	unlink(midx_name);
+	free(midx_name);
+
+	return multi_pack_index_write(opts);
+}
+
+static int multi_pack_index_verify(struct maintenance_opts *opts,
+				   const char *message)
+{
+	struct child_process child = CHILD_PROCESS_INIT;
+
+	child.git_cmd = 1;
+	strvec_pushl(&child.args, "multi-pack-index", "verify", NULL);
+
+	if (opts->quiet)
+		strvec_push(&child.args, "--no-progress");
+
+	if (run_command(&child)) {
+		warning(_("'git multi-pack-index verify' failed %s"), message);
+		return 1;
+	}
+
+	return 0;
+}
+
+static int multi_pack_index_expire(struct maintenance_opts *opts)
+{
+	struct child_process child = CHILD_PROCESS_INIT;
+
+	child.git_cmd = 1;
+	strvec_pushl(&child.args, "multi-pack-index", "expire", NULL);
+
+	if (opts->quiet)
+		strvec_push(&child.args, "--no-progress");
+
+	close_object_store(the_repository->objects);
+
+	if (run_command(&child))
+		return error(_("'git multi-pack-index expire' failed"));
+
+	return 0;
+}
+
+static int multi_pack_index_repack(struct maintenance_opts *opts)
+{
+	struct child_process child = CHILD_PROCESS_INIT;
+
+	child.git_cmd = 1;
+	strvec_pushl(&child.args, "multi-pack-index", "repack", NULL);
+
+	if (opts->quiet)
+		strvec_push(&child.args, "--no-progress");
+
+	strvec_push(&child.args, "--batch-size=0");
+
+	close_object_store(the_repository->objects);
+
+	if (run_command(&child))
+		return error(_("'git multi-pack-index repack' failed"));
+
+	return 0;
+}
+
+static int maintenance_task_incremental_repack(struct maintenance_opts *opts)
+{
+	prepare_repo_settings(the_repository);
+	if (!the_repository->settings.core_multi_pack_index) {
+		warning(_("skipping incremental-repack task because core.multiPackIndex is disabled"));
+		return 0;
+	}
+
+	if (multi_pack_index_write(opts))
+		return 1;
+	if (multi_pack_index_verify(opts, "after initial write"))
+		return rewrite_multi_pack_index(opts);
+	if (multi_pack_index_expire(opts))
+		return 1;
+	if (multi_pack_index_verify(opts, "after expire step"))
+		return !!rewrite_multi_pack_index(opts);
+	if (multi_pack_index_repack(opts))
+		return 1;
+	if (multi_pack_index_verify(opts, "after repack step"))
+		return !!rewrite_multi_pack_index(opts);
+	return 0;
+}
+
 typedef int maintenance_task_fn(struct maintenance_opts *opts);
 
 /*
@@ -1050,6 +1158,7 @@ struct maintenance_task {
 enum maintenance_task_label {
 	TASK_PREFETCH,
 	TASK_LOOSE_OBJECTS,
+	TASK_INCREMENTAL_REPACK,
 	TASK_GC,
 	TASK_COMMIT_GRAPH,
 
@@ -1067,6 +1176,10 @@ static struct maintenance_task tasks[] = {
 		maintenance_task_loose_objects,
 		loose_object_auto_condition,
 	},
+	[TASK_INCREMENTAL_REPACK] = {
+		"incremental-repack",
+		maintenance_task_incremental_repack,
+	},
 	[TASK_GC] = {
 		"gc",
 		maintenance_task_gc,
diff --git a/midx.c b/midx.c
index aa37d5da86..66d7053d83 100644
--- a/midx.c
+++ b/midx.c
@@ -37,7 +37,7 @@
 
 #define PACK_EXPIRED UINT_MAX
 
-static char *get_midx_filename(const char *object_dir)
+char *get_midx_filename(const char *object_dir)
 {
 	return xstrfmt("%s/pack/multi-pack-index", object_dir);
 }
diff --git a/midx.h b/midx.h
index b18cf53bc4..baeecc70c9 100644
--- a/midx.h
+++ b/midx.h
@@ -37,6 +37,7 @@ struct multi_pack_index {
 
 #define MIDX_PROGRESS     (1 << 0)
 
+char *get_midx_filename(const char *object_dir);
 struct multi_pack_index *load_multi_pack_index(const char *object_dir, int local);
 int prepare_midx_pack(struct repository *r, struct multi_pack_index *m, uint32_t pack_int_id);
 int bsearch_midx(const struct object_id *oid, struct multi_pack_index *m, uint32_t *result);
diff --git a/t/t5319-multi-pack-index.sh b/t/t5319-multi-pack-index.sh
index 12f41dfc18..26f224b0e3 100755
--- a/t/t5319-multi-pack-index.sh
+++ b/t/t5319-multi-pack-index.sh
@@ -3,6 +3,7 @@
 test_description='multi-pack-indexes'
 . ./test-lib.sh
 
+GIT_TEST_MULTI_PACK_INDEX=0
 objdir=.git/objects
 
 midx_read_expect () {
diff --git a/t/t7900-maintenance.sh b/t/t7900-maintenance.sh
index 71ac686c09..be19ac7623 100755
--- a/t/t7900-maintenance.sh
+++ b/t/t7900-maintenance.sh
@@ -5,6 +5,7 @@ test_description='git maintenance builtin'
 . ./test-lib.sh
 
 GIT_TEST_COMMIT_GRAPH=0
+GIT_TEST_MULTI_PACK_INDEX=0
 
 test_expect_success 'help text' '
 	test_expect_code 129 git maintenance -h 2>err &&
@@ -147,4 +148,41 @@ test_expect_success 'maintenance.loose-objects.auto' '
 	done
 '
 
+test_expect_success 'incremental-repack task' '
+	packDir=.git/objects/pack &&
+	for i in $(test_seq 1 5)
+	do
+		test_commit $i || return 1
+	done &&
+
+	# Create three disjoint pack-files with size BIG, small, small.
+	echo HEAD~2 | git pack-objects --revs $packDir/test-1 &&
+	test_tick &&
+	git pack-objects --revs $packDir/test-2 <<-\EOF &&
+	HEAD~1
+	^HEAD~2
+	EOF
+	test_tick &&
+	git pack-objects --revs $packDir/test-3 <<-\EOF &&
+	HEAD
+	^HEAD~1
+	EOF
+	rm -f $packDir/pack-* &&
+	rm -f $packDir/loose-* &&
+	ls $packDir/*.pack >packs-before &&
+	test_line_count = 3 packs-before &&
+
+	# the job repacks the two into a new pack, but does not
+	# delete the old ones.
+	git maintenance run --task=incremental-repack &&
+	ls $packDir/*.pack >packs-between &&
+	test_line_count = 4 packs-between &&
+
+	# the job deletes the two old packs, and does not write
+	# a new one because only one pack remains.
+	git maintenance run --task=incremental-repack &&
+	ls .git/objects/pack/*.pack >packs-after &&
+	test_line_count = 1 packs-after
+'
+
 test_done
