diff --git a/CHANGELOG.md b/CHANGELOG.md
index 17e69fffec..b030545ec7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -57,7 +57,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   revsets now support glob matching.
 
 * `jj branch delete`/`forget` now support [string pattern
-  syntax](docs/revsets.md#string-patterns).
+  syntax](docs/revsets.md#string-patterns). The `--glob` option is deprecated in
+  favor of `glob:` pattern.
 
 ### Fixed bugs
 
diff --git a/cli/src/commands/branch.rs b/cli/src/commands/branch.rs
index 14b68888c7..0e5349d64f 100644
--- a/cli/src/commands/branch.rs
+++ b/cli/src/commands/branch.rs
@@ -62,8 +62,8 @@ pub struct BranchDeleteArgs {
     #[arg(required_unless_present_any(&["glob"]), value_parser = parse_name_pattern)]
     pub names: Vec<StringPattern>,
 
-    /// A glob pattern indicating branches to delete.
-    #[arg(long, value_parser = StringPattern::glob)]
+    /// Deprecated. Please prefix the pattern with `glob:` instead.
+    #[arg(long, hide = true, value_parser = StringPattern::glob)]
     pub glob: Vec<StringPattern>,
 }
 
@@ -107,8 +107,8 @@ pub struct BranchForgetArgs {
     #[arg(required_unless_present_any(&["glob"]), value_parser = parse_name_pattern)]
     pub names: Vec<StringPattern>,
 
-    /// A glob pattern indicating branches to forget.
-    #[arg(long, value_parser = StringPattern::glob)]
+    /// Deprecated. Please prefix the pattern with `glob:` instead.
+    #[arg(long, hide = true, value_parser = StringPattern::glob)]
     pub glob: Vec<StringPattern>,
 }
 
@@ -347,6 +347,12 @@ fn cmd_branch_delete(
 ) -> Result<(), CommandError> {
     let mut workspace_command = command.workspace_helper(ui)?;
     let view = workspace_command.repo().view();
+    if !args.glob.is_empty() {
+        writeln!(
+            ui.warning(),
+            "--glob has been deprecated. Please prefix the pattern with `glob:` instead."
+        )?;
+    }
     let name_patterns = [&args.names[..], &args.glob[..]].concat();
     let names = find_local_branches(view, &name_patterns)?;
     let mut tx =
@@ -369,6 +375,12 @@ fn cmd_branch_forget(
 ) -> Result<(), CommandError> {
     let mut workspace_command = command.workspace_helper(ui)?;
     let view = workspace_command.repo().view();
+    if !args.glob.is_empty() {
+        writeln!(
+            ui.warning(),
+            "--glob has been deprecated. Please prefix the pattern with `glob:` instead."
+        )?;
+    }
     let name_patterns = [&args.names[..], &args.glob[..]].concat();
     let names = find_forgettable_branches(view, &name_patterns)?;
     let mut tx =
diff --git a/cli/tests/test_branch_command.rs b/cli/tests/test_branch_command.rs
index 312ed340bc..7b1f3693fe 100644
--- a/cli/tests/test_branch_command.rs
+++ b/cli/tests/test_branch_command.rs
@@ -99,6 +99,7 @@ fn test_branch_forget_glob() {
         test_env.jj_cmd_ok(&repo_path, &["branch", "forget", "--glob", "foo-[1-3]"]);
     insta::assert_snapshot!(stdout, @"");
     insta::assert_snapshot!(stderr, @r###"
+    --glob has been deprecated. Please prefix the pattern with `glob:` instead.
     Forgot 2 branches.
     "###);
     test_env.jj_cmd_ok(&repo_path, &["undo"]);
@@ -119,7 +120,9 @@ fn test_branch_forget_glob() {
         &["branch", "forget", "foo-4", "--glob", "foo-*", "glob:foo-*"],
     );
     insta::assert_snapshot!(stdout, @"");
-    insta::assert_snapshot!(stderr, @"");
+    insta::assert_snapshot!(stderr, @r###"
+    --glob has been deprecated. Please prefix the pattern with `glob:` instead.
+    "###);
     insta::assert_snapshot!(get_log_output(&test_env, &repo_path), @r###"
     @  bar-2 230dd059e1b0
     ◉   000000000000
@@ -139,6 +142,7 @@ fn test_branch_forget_glob() {
         &["branch", "forget", "glob:bar*", "glob:baz*", "--glob=boom*"],
     );
     insta::assert_snapshot!(stderr, @r###"
+    --glob has been deprecated. Please prefix the pattern with `glob:` instead.
     Error: No matching branches for patterns: baz*, boom*
     "###);
 }
@@ -177,6 +181,7 @@ fn test_branch_delete_glob() {
         test_env.jj_cmd_ok(&repo_path, &["branch", "delete", "--glob", "foo-[1-3]"]);
     insta::assert_snapshot!(stdout, @"");
     insta::assert_snapshot!(stderr, @r###"
+    --glob has been deprecated. Please prefix the pattern with `glob:` instead.
     Deleted 2 branches.
     "###);
     test_env.jj_cmd_ok(&repo_path, &["undo"]);
@@ -194,6 +199,7 @@ fn test_branch_delete_glob() {
     // forget`, it's not allowed to delete already deleted branches.
     let stderr = test_env.jj_cmd_failure(&repo_path, &["branch", "delete", "--glob=foo-[1-3]"]);
     insta::assert_snapshot!(stderr, @r###"
+    --glob has been deprecated. Please prefix the pattern with `glob:` instead.
     Error: No matching branches for patterns: foo-[1-3]
     "###);
 
@@ -204,7 +210,9 @@ fn test_branch_delete_glob() {
         &["branch", "delete", "foo-4", "--glob", "foo-*", "glob:foo-*"],
     );
     insta::assert_snapshot!(stdout, @"");
-    insta::assert_snapshot!(stderr, @"");
+    insta::assert_snapshot!(stderr, @r###"
+    --glob has been deprecated. Please prefix the pattern with `glob:` instead.
+    "###);
     insta::assert_snapshot!(get_log_output(&test_env, &repo_path), @r###"
     @  bar-2 foo-1@origin foo-3@origin foo-4@origin 6fbf398c2d59
     ◉   000000000000