diff --git a/builtin/commit.c b/builtin/commit.c
index 505fe60956..05594fa8ab 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -105,7 +105,8 @@ static const char *template_file;
  */
 static const char *author_message, *author_message_buffer;
 static char *edit_message, *use_message;
-static char *fixup_message, *squash_message;
+static char *fixup_message, *fixup_commit, *squash_message;
+static const char *fixup_prefix;
 static int all, also, interactive, patch_interactive, only, amend, signoff;
 static int edit_flag = -1; /* unspecified */
 static int quiet, verbose, no_verify, allow_empty, dry_run, renew_authorship;
@@ -357,7 +358,8 @@ static const char *prepare_index(const char **argv, const char *prefix,
 		die(_("--pathspec-file-nul requires --pathspec-from-file"));
 	}
 
-	if (!pathspec.nr && (also || (only && !amend && !allow_empty)))
+	if (!pathspec.nr && (also || (only && !allow_empty &&
+	    (!amend || (fixup_message && strcmp(fixup_prefix, "amend"))))))
 		die(_("No paths with --include/--only does not make sense."));
 
 	if (read_cache_preload(&pathspec) < 0)
@@ -681,6 +683,23 @@ static void adjust_comment_line_char(const struct strbuf *sb)
 	comment_line_char = *p;
 }
 
+static int prepare_amend_commit(struct commit *commit, struct strbuf *sb,
+				struct pretty_print_context *ctx) {
+
+	const char *buffer, *subject, *fmt;
+
+	buffer = get_commit_buffer(commit, NULL);
+	find_commit_subject(buffer, &subject);
+	/*
+	 * If we amend the 'amend!' commit then we don't want to
+	 * duplicate the subject line.
+	 */
+	fmt = starts_with(subject, "amend!") ? "%b" : "%B";
+	format_commit_message(commit, fmt, sb, ctx);
+	unuse_commit_buffer(commit, buffer);
+	return 0;
+}
+
 static int prepare_to_commit(const char *index_file, const char *prefix,
 			     struct commit *current_head,
 			     struct wt_status *s,
@@ -745,15 +764,32 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
 	} else if (fixup_message) {
 		struct pretty_print_context ctx = {0};
 		struct commit *commit;
-		commit = lookup_commit_reference_by_name(fixup_message);
+		char *fmt = xstrfmt("%s! %%s\n\n", fixup_prefix);
+		commit = lookup_commit_reference_by_name(fixup_commit);
 		if (!commit)
-			die(_("could not lookup commit %s"), fixup_message);
+			die(_("could not lookup commit %s"), fixup_commit);
 		ctx.output_encoding = get_commit_output_encoding();
-		format_commit_message(commit, "fixup! %s\n\n",
-				      &sb, &ctx);
-		if (have_option_m)
-			strbuf_addbuf(&sb, &message);
+		format_commit_message(commit, fmt, &sb, &ctx);
+		free(fmt);
 		hook_arg1 = "message";
+
+		/*
+		 * Only `-m` commit message option is checked here, as
+		 * it supports `--fixup` to append the commit message.
+		 *
+		 * The other commit message options `-c`/`-C`/`-F` are
+		 * incompatible with all the forms of `--fixup` and
+		 * have already errored out while parsing the `git commit`
+		 * options.
+		 */
+		if (have_option_m && !strcmp(fixup_prefix, "fixup"))
+			strbuf_addbuf(&sb, &message);
+
+		if (!strcmp(fixup_prefix, "amend")) {
+			if (have_option_m)
+				die(_("cannot combine -m with --fixup:%s"), fixup_message);
+			prepare_amend_commit(commit, &sb, &ctx);
+		}
 	} else if (!stat(git_path_merge_msg(the_repository), &statbuf)) {
 		size_t merge_msg_start;
 
@@ -1152,6 +1188,12 @@ static void finalize_deferred_config(struct wt_status *s)
 		s->ahead_behind_flags = AHEAD_BEHIND_FULL;
 }
 
+/* returns the length of intial segment of alpha characters only */
+static size_t get_alpha_len(char *fixup_message) {
+	const char alphas[] = "abcdefghijklmnopqrstuvwxyz";
+	return strspn(fixup_message, alphas);
+}
+
 static int parse_and_validate_options(int argc, const char *argv[],
 				      const struct option *options,
 				      const char * const usage[],
@@ -1170,7 +1212,7 @@ static int parse_and_validate_options(int argc, const char *argv[],
 	if (force_author && renew_authorship)
 		die(_("Using both --reset-author and --author does not make sense"));
 
-	if (logfile || have_option_m || use_message || fixup_message)
+	if (logfile || have_option_m || use_message)
 		use_editor = 0;
 	if (0 <= edit_flag)
 		use_editor = edit_flag;
@@ -1227,6 +1269,34 @@ static int parse_and_validate_options(int argc, const char *argv[],
 
 	if (also + only + all + interactive > 1)
 		die(_("Only one of --include/--only/--all/--interactive/--patch can be used."));
+
+	if (fixup_message) {
+		/*
+		 * To check if fixup_message that contains ':' is a commit
+		 * reference for example: --fixup="HEAD^{/^area: string}" or
+		 * a suboption of `--fixup`.
+		 *
+		 * As `amend` suboption contains only alpha character.
+		 * So check if first non alpha character in fixup_message
+		 * is ':'.
+		 */
+		size_t len = get_alpha_len(fixup_message);
+		if (len && fixup_message[len] == ':') {
+			fixup_message[len++] = '\0';
+			fixup_commit = fixup_message + len;
+			if (!strcmp("amend", fixup_message)) {
+				fixup_prefix = "amend";
+				allow_empty = 1;
+			} else {
+				die(_("unknown option: --fixup=%s:%s"), fixup_message, fixup_commit);
+			}
+		} else {
+			fixup_commit = fixup_message;
+			fixup_prefix = "fixup";
+			use_editor = 0;
+		}
+	}
+
 	cleanup_mode = get_cleanup_mode(cleanup_arg, use_editor);
 
 	handle_untracked_files_arg(s);
@@ -1504,7 +1574,11 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
 		OPT_CALLBACK('m', "message", &message, N_("message"), N_("commit message"), opt_parse_m),
 		OPT_STRING('c', "reedit-message", &edit_message, N_("commit"), N_("reuse and edit message from specified commit")),
 		OPT_STRING('C', "reuse-message", &use_message, N_("commit"), N_("reuse message from specified commit")),
-		OPT_STRING(0, "fixup", &fixup_message, N_("commit"), N_("use autosquash formatted message to fixup specified commit")),
+		/*
+		 * TRANSLATORS: Leave "[amend:]" as-is, and
+		 * only translate <commit>.
+		 */
+		OPT_STRING(0, "fixup", &fixup_message, N_("[amend:]commit"), N_("use autosquash formatted message to fixup or amend specified commit")),
 		OPT_STRING(0, "squash", &squash_message, N_("commit"), N_("use autosquash formatted message to squash specified commit")),
 		OPT_BOOL(0, "reset-author", &renew_authorship, N_("the commit is authored by me now (used with -C/-c/--amend)")),
 		OPT_BOOL('s', "signoff", &signoff, N_("add a Signed-off-by trailer")),
@@ -1663,6 +1737,19 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
 		exit(1);
 	}
 
+	if (fixup_message && starts_with(sb.buf, "amend! ") &&
+	    !allow_empty_message) {
+		struct strbuf body = STRBUF_INIT;
+		size_t len = commit_subject_length(sb.buf);
+		strbuf_addstr(&body, sb.buf + len);
+		if (message_is_empty(&body, cleanup_mode)) {
+			rollback_index_files();
+			fprintf(stderr, _("Aborting commit due to empty commit message body.\n"));
+			exit(1);
+		}
+		strbuf_release(&body);
+	}
+
 	if (amend) {
 		const char *exclude_gpgsig[3] = { "gpgsig", "gpgsig-sha256", NULL };
 		extra = read_commit_extra_headers(current_head, exclude_gpgsig);
