diff --git a/Documentation/config/gpg.txt b/Documentation/config/gpg.txt
index cce2c89245..030311fce3 100644
--- a/Documentation/config/gpg.txt
+++ b/Documentation/config/gpg.txt
@@ -18,3 +18,14 @@ gpg.<format>.program::
 	chose. (see `gpg.program` and `gpg.format`) `gpg.program` can still
 	be used as a legacy synonym for `gpg.openpgp.program`. The default
 	value for `gpg.x509.program` is "gpgsm".
+
+gpg.minTrustLevel::
+	Specifies a minimum trust level for signature verification.  The
+	default value is "undefined".  Supported values (in increasing
+	order of significance):
++
+* `undefined`
+* `never`
+* `marginal`
+* `fully`
+* `ultimate`
diff --git a/Documentation/pretty-formats.txt b/Documentation/pretty-formats.txt
index 1a7212ce5a..f2e74241fe 100644
--- a/Documentation/pretty-formats.txt
+++ b/Documentation/pretty-formats.txt
@@ -215,7 +215,6 @@ endif::git-rev-list[]
 '%GG':: raw verification message from GPG for a signed commit
 '%G?':: show "G" for a good (valid) signature,
 	"B" for a bad signature,
-	"U" for a good signature with unknown validity,
 	"X" for a good signature that has expired,
 	"Y" for a good signature made by an expired key,
 	"R" for a good signature made by a revoked key,
@@ -226,6 +225,7 @@ endif::git-rev-list[]
 '%GF':: show the fingerprint of the key used to sign a signed commit
 '%GP':: show the fingerprint of the primary key whose subkey was used
 	to sign a signed commit
+'%GT':: show the trust level for the key used to sign a signed commit
 '%gD':: reflog selector, e.g., `refs/stash@{1}` or `refs/stash@{2
 	minutes ago}`; the format follows the rules described for the
 	`-g` option. The portion before the `@` is the refname as
diff --git a/commit.c b/commit.c
index 434ec030d6..f6d3ce4a6e 100644
--- a/commit.c
+++ b/commit.c
@@ -1140,17 +1140,18 @@ void verify_merge_signature(struct commit *commit, int verbosity)
 {
 	char hex[GIT_MAX_HEXSZ + 1];
 	struct signature_check signature_check;
+	int ret;
 	memset(&signature_check, 0, sizeof(signature_check));
 
-	check_commit_signature(commit, &signature_check);
+	ret = check_commit_signature(commit, &signature_check);
 
 	find_unique_abbrev_r(hex, &commit->object.oid, DEFAULT_ABBREV);
 	switch (signature_check.result) {
 	case 'G':
+		if (ret)
+			die(_("Commit %s has an untrusted GPG signature, "
+			      "allegedly by %s."), hex, signature_check.signer);
 		break;
-	case 'U':
-		die(_("Commit %s has an untrusted GPG signature, "
-		      "allegedly by %s."), hex, signature_check.signer);
 	case 'B':
 		die(_("Commit %s has a bad GPG signature "
 		      "allegedly by %s."), hex, signature_check.signer);
diff --git a/gpg-interface.c b/gpg-interface.c
index 5134ce2780..f7b11480fb 100644
--- a/gpg-interface.c
+++ b/gpg-interface.c
@@ -7,6 +7,8 @@
 #include "tempfile.h"
 
 static char *configured_signing_key;
+static enum signature_trust_level configured_min_trust_level = TRUST_UNDEFINED;
+
 struct gpg_format {
 	const char *name;
 	const char *program;
@@ -85,6 +87,8 @@ void signature_check_clear(struct signature_check *sigc)
 #define GPG_STATUS_UID		(1<<2)
 /* The status includes key fingerprints */
 #define GPG_STATUS_FINGERPRINT	(1<<3)
+/* The status includes trust level */
+#define GPG_STATUS_TRUST_LEVEL	(1<<4)
 
 /* Short-hand for standard exclusive *SIG status with keyid & UID */
 #define GPG_STATUS_STDSIG	(GPG_STATUS_EXCLUSIVE|GPG_STATUS_KEYID|GPG_STATUS_UID)
@@ -96,13 +100,23 @@ static struct {
 } sigcheck_gpg_status[] = {
 	{ 'G', "GOODSIG ", GPG_STATUS_STDSIG },
 	{ 'B', "BADSIG ", GPG_STATUS_STDSIG },
-	{ 'U', "TRUST_NEVER", 0 },
-	{ 'U', "TRUST_UNDEFINED", 0 },
 	{ 'E', "ERRSIG ", GPG_STATUS_EXCLUSIVE|GPG_STATUS_KEYID },
 	{ 'X', "EXPSIG ", GPG_STATUS_STDSIG },
 	{ 'Y', "EXPKEYSIG ", GPG_STATUS_STDSIG },
 	{ 'R', "REVKEYSIG ", GPG_STATUS_STDSIG },
 	{ 0, "VALIDSIG ", GPG_STATUS_FINGERPRINT },
+	{ 0, "TRUST_", GPG_STATUS_TRUST_LEVEL },
+};
+
+static struct {
+	const char *key;
+	enum signature_trust_level value;
+} sigcheck_gpg_trust_level[] = {
+	{ "UNDEFINED", TRUST_UNDEFINED },
+	{ "NEVER", TRUST_NEVER },
+	{ "MARGINAL", TRUST_MARGINAL },
+	{ "FULLY", TRUST_FULLY },
+	{ "ULTIMATE", TRUST_ULTIMATE },
 };
 
 static void replace_cstring(char **field, const char *line, const char *next)
@@ -115,10 +129,25 @@ static void replace_cstring(char **field, const char *line, const char *next)
 		*field = NULL;
 }
 
+static int parse_gpg_trust_level(const char *level,
+				 enum signature_trust_level *res)
+{
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(sigcheck_gpg_trust_level); i++) {
+		if (!strcmp(sigcheck_gpg_trust_level[i].key, level)) {
+			*res = sigcheck_gpg_trust_level[i].value;
+			return 0;
+		}
+	}
+	return 1;
+}
+
 static void parse_gpg_output(struct signature_check *sigc)
 {
 	const char *buf = sigc->gpg_status;
 	const char *line, *next;
+	char *trust;
 	int i, j;
 	int seen_exclusive_status = 0;
 
@@ -136,9 +165,18 @@ static void parse_gpg_output(struct signature_check *sigc)
 		/* Iterate over all search strings */
 		for (i = 0; i < ARRAY_SIZE(sigcheck_gpg_status); i++) {
 			if (skip_prefix(line, sigcheck_gpg_status[i].check, &line)) {
+				/*
+				 * GOODSIG, BADSIG etc. can occur only once for
+				 * each signature.  Therefore, if we had more
+				 * than one then we're dealing with multiple
+				 * signatures.  We don't support them
+				 * currently, and they're rather hard to
+				 * create, so something is likely fishy and we
+				 * should reject them altogether.
+				 */
 				if (sigcheck_gpg_status[i].flags & GPG_STATUS_EXCLUSIVE) {
 					if (seen_exclusive_status++)
-						goto found_duplicate_status;
+						goto error;
 				}
 
 				if (sigcheck_gpg_status[i].result)
@@ -154,6 +192,18 @@ static void parse_gpg_output(struct signature_check *sigc)
 						replace_cstring(&sigc->signer, line, next);
 					}
 				}
+
+				/* Do we have trust level? */
+				if (sigcheck_gpg_status[i].flags & GPG_STATUS_TRUST_LEVEL) {
+					next = strchrnul(line, ' ');
+					trust = xmemdupz(line, next - line);
+					if (parse_gpg_trust_level(trust, &sigc->trust_level)) {
+						free(trust);
+						goto error;
+					}
+					free(trust);
+				}
+
 				/* Do we have fingerprint? */
 				if (sigcheck_gpg_status[i].flags & GPG_STATUS_FINGERPRINT) {
 					const char *limit;
@@ -191,14 +241,7 @@ static void parse_gpg_output(struct signature_check *sigc)
 	}
 	return;
 
-found_duplicate_status:
-	/*
-	 * GOODSIG, BADSIG etc. can occur only once for each signature.
-	 * Therefore, if we had more than one then we're dealing with multiple
-	 * signatures.  We don't support them currently, and they're rather
-	 * hard to create, so something is likely fishy and we should reject
-	 * them altogether.
-	 */
+error:
 	sigc->result = 'E';
 	/* Clear partial data to avoid confusion */
 	FREE_AND_NULL(sigc->primary_key_fingerprint);
@@ -264,6 +307,7 @@ int check_signature(const char *payload, size_t plen, const char *signature,
 	int status;
 
 	sigc->result = 'N';
+	sigc->trust_level = -1;
 
 	status = verify_signed_buffer(payload, plen, signature, slen,
 				      &gpg_output, &gpg_status);
@@ -273,7 +317,8 @@ int check_signature(const char *payload, size_t plen, const char *signature,
 	sigc->gpg_output = strbuf_detach(&gpg_output, NULL);
 	sigc->gpg_status = strbuf_detach(&gpg_status, NULL);
 	parse_gpg_output(sigc);
-	status |= sigc->result != 'G' && sigc->result != 'U';
+	status |= sigc->result != 'G';
+	status |= sigc->trust_level < configured_min_trust_level;
 
  out:
 	strbuf_release(&gpg_status);
@@ -320,6 +365,8 @@ int git_gpg_config(const char *var, const char *value, void *cb)
 {
 	struct gpg_format *fmt = NULL;
 	char *fmtname = NULL;
+	char *trust;
+	int ret;
 
 	if (!strcmp(var, "user.signingkey")) {
 		if (!value)
@@ -339,6 +386,20 @@ int git_gpg_config(const char *var, const char *value, void *cb)
 		return 0;
 	}
 
+	if (!strcmp(var, "gpg.mintrustlevel")) {
+		if (!value)
+			return config_error_nonbool(var);
+
+		trust = xstrdup_toupper(value);
+		ret = parse_gpg_trust_level(trust, &configured_min_trust_level);
+		free(trust);
+
+		if (ret)
+			return error("unsupported value for %s: %s", var,
+				     value);
+		return 0;
+	}
+
 	if (!strcmp(var, "gpg.program") || !strcmp(var, "gpg.openpgp.program"))
 		fmtname = "openpgp";
 
diff --git a/gpg-interface.h b/gpg-interface.h
index 93cc3aff5c..f4e9b4f371 100644
--- a/gpg-interface.h
+++ b/gpg-interface.h
@@ -7,6 +7,14 @@ struct strbuf;
 #define GPG_VERIFY_RAW			2
 #define GPG_VERIFY_OMIT_STATUS	4
 
+enum signature_trust_level {
+	TRUST_UNDEFINED,
+	TRUST_NEVER,
+	TRUST_MARGINAL,
+	TRUST_FULLY,
+	TRUST_ULTIMATE,
+};
+
 struct signature_check {
 	char *payload;
 	char *gpg_output;
@@ -16,7 +24,6 @@ struct signature_check {
 	 * possible "result":
 	 * 0 (not checked)
 	 * N (checked but no further result)
-	 * U (untrusted good)
 	 * G (good)
 	 * B (bad)
 	 */
@@ -25,6 +32,7 @@ struct signature_check {
 	char *key;
 	char *fingerprint;
 	char *primary_key_fingerprint;
+	enum signature_trust_level trust_level;
 };
 
 void signature_check_clear(struct signature_check *sigc);
diff --git a/pretty.c b/pretty.c
index 305e903192..0afe05714d 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1313,7 +1313,6 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 			case 'G':
 			case 'B':
 			case 'E':
-			case 'U':
 			case 'N':
 			case 'X':
 			case 'Y':
@@ -1337,6 +1336,25 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
 			if (c->signature_check.primary_key_fingerprint)
 				strbuf_addstr(sb, c->signature_check.primary_key_fingerprint);
 			break;
+		case 'T':
+			switch (c->signature_check.trust_level) {
+			case TRUST_UNDEFINED:
+				strbuf_addstr(sb, "undefined");
+				break;
+			case TRUST_NEVER:
+				strbuf_addstr(sb, "never");
+				break;
+			case TRUST_MARGINAL:
+				strbuf_addstr(sb, "marginal");
+				break;
+			case TRUST_FULLY:
+				strbuf_addstr(sb, "fully");
+				break;
+			case TRUST_ULTIMATE:
+				strbuf_addstr(sb, "ultimate");
+				break;
+			}
+			break;
 		default:
 			return 0;
 		}
diff --git a/t/t5573-pull-verify-signatures.sh b/t/t5573-pull-verify-signatures.sh
index 3e9876e197..d7d46d9382 100755
--- a/t/t5573-pull-verify-signatures.sh
+++ b/t/t5573-pull-verify-signatures.sh
@@ -56,6 +56,13 @@ test_expect_success GPG 'pull commit with bad signature with --verify-signatures
 
 test_expect_success GPG 'pull commit with untrusted signature with --verify-signatures' '
 	test_when_finished "git reset --hard && git checkout initial" &&
+	git pull --ff-only --verify-signatures untrusted >pulloutput &&
+	test_i18ngrep "has a good GPG signature" pulloutput
+'
+
+test_expect_success GPG 'pull commit with untrusted signature with --verify-signatures and minTrustLevel' '
+	test_when_finished "git reset --hard && git checkout initial" &&
+	test_config gpg.minTrustLevel marginal &&
 	test_must_fail git pull --ff-only --verify-signatures untrusted 2>pullerror &&
 	test_i18ngrep "has an untrusted GPG signature" pullerror
 '
diff --git a/t/t7510-signed-commit.sh b/t/t7510-signed-commit.sh
index 682b23a068..8ab29e80ce 100755
--- a/t/t7510-signed-commit.sh
+++ b/t/t7510-signed-commit.sh
@@ -109,6 +109,21 @@ test_expect_success GPG 'verify-commit exits success on untrusted signature' '
 	grep "not certified" actual
 '
 
+test_expect_success GPG 'verify-commit exits success with matching minTrustLevel' '
+	test_config gpg.minTrustLevel ultimate &&
+	git verify-commit sixth-signed
+'
+
+test_expect_success GPG 'verify-commit exits success with low minTrustLevel' '
+	test_config gpg.minTrustLevel fully &&
+	git verify-commit sixth-signed
+'
+
+test_expect_success GPG 'verify-commit exits failure with high minTrustLevel' '
+	test_config gpg.minTrustLevel ultimate &&
+	test_must_fail git verify-commit eighth-signed-alt
+'
+
 test_expect_success GPG 'verify signatures with --raw' '
 	(
 		for commit in initial second merge fourth-signed fifth-signed sixth-signed seventh-signed
@@ -209,13 +224,13 @@ test_expect_success GPG 'show bad signature with custom format' '
 
 test_expect_success GPG 'show untrusted signature with custom format' '
 	cat >expect <<-\EOF &&
-	U
+	undefined
 	65A0EEA02E30CAD7
 	Eris Discordia <discord@example.net>
 	F8364A59E07FFE9F4D63005A65A0EEA02E30CAD7
 	D4BE22311AD3131E5EDA29A461092E85B7227189
 	EOF
-	git log -1 --format="%G?%n%GK%n%GS%n%GF%n%GP" eighth-signed-alt >actual &&
+	git log -1 --format="%GT%n%GK%n%GS%n%GF%n%GP" eighth-signed-alt >actual &&
 	test_cmp expect actual
 '
 
diff --git a/t/t7612-merge-verify-signatures.sh b/t/t7612-merge-verify-signatures.sh
index d99218a725..5a8e9afd8e 100755
--- a/t/t7612-merge-verify-signatures.sh
+++ b/t/t7612-merge-verify-signatures.sh
@@ -62,6 +62,13 @@ test_expect_success GPG 'merge commit with bad signature with merge.verifySignat
 
 test_expect_success GPG 'merge commit with untrusted signature with verification' '
 	test_when_finished "git reset --hard && git checkout initial" &&
+	git merge --ff-only --verify-signatures side-untrusted >mergeoutput &&
+	test_i18ngrep "has a good GPG signature" mergeoutput
+'
+
+test_expect_success GPG 'merge commit with untrusted signature with verification and minTrustLevel' '
+	test_when_finished "git reset --hard && git checkout initial" &&
+	test_config gpg.minTrustLevel marginal &&
 	test_must_fail git merge --ff-only --verify-signatures side-untrusted 2>mergeerror &&
 	test_i18ngrep "has an untrusted GPG signature" mergeerror
 '
@@ -69,6 +76,14 @@ test_expect_success GPG 'merge commit with untrusted signature with verification
 test_expect_success GPG 'merge commit with untrusted signature with merge.verifySignatures=true' '
 	test_when_finished "git reset --hard && git checkout initial" &&
 	test_config merge.verifySignatures true &&
+	git merge --ff-only side-untrusted >mergeoutput &&
+	test_i18ngrep "has a good GPG signature" mergeoutput
+'
+
+test_expect_success GPG 'merge commit with untrusted signature with merge.verifySignatures=true and minTrustLevel' '
+	test_when_finished "git reset --hard && git checkout initial" &&
+	test_config merge.verifySignatures true &&
+	test_config gpg.minTrustLevel marginal &&
 	test_must_fail git merge --ff-only side-untrusted 2>mergeerror &&
 	test_i18ngrep "has an untrusted GPG signature" mergeerror
 '
