diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6b48d6c3787..04c5bf7af16 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### New features
 
 * Information about new and resolved conflicts is now printed by every command.
+* `jj branch` has gained a new `rename` subcommand that allows changing a branch
+  name atomically. `jj branch help rename` for details.
 
 ### Fixed bugs
 
diff --git a/cli/src/commands/branch.rs b/cli/src/commands/branch.rs
index b8699268214..027d78b0de9 100644
--- a/cli/src/commands/branch.rs
+++ b/cli/src/commands/branch.rs
@@ -34,6 +34,8 @@ pub enum BranchSubcommand {
     Forget(BranchForgetArgs),
     #[command(visible_alias("l"))]
     List(BranchListArgs),
+    #[command(visible_alias("r"))]
+    Rename(BranchRenameArgs),
     #[command(visible_alias("s"))]
     Set(BranchSetArgs),
     Track(BranchTrackArgs),
@@ -122,6 +124,22 @@ pub struct BranchForgetArgs {
     pub glob: Vec<StringPattern>,
 }
 
+/// Rename an existing branch pointed to by a specified commit.
+#[derive(clap::Args, Clone, Debug)]
+pub struct BranchRenameArgs {
+    /// The old name of the branch.
+    #[arg(required = true)]
+    pub old: String,
+
+    /// The old branch's target revision.
+    #[arg(long, short)]
+    pub revision: Option<RevisionArg>,
+
+    /// The new name of the branch.
+    #[arg(required = true)]
+    pub new: String,
+}
+
 /// Update an existing branch to point to a certain commit.
 #[derive(clap::Args, Clone, Debug)]
 pub struct BranchSetArgs {
@@ -248,6 +266,7 @@ pub fn cmd_branch(
 ) -> Result<(), CommandError> {
     match subcommand {
         BranchSubcommand::Create(sub_args) => cmd_branch_create(ui, command, sub_args),
+        BranchSubcommand::Rename(sub_args) => cmd_branch_rename(ui, command, sub_args),
         BranchSubcommand::Set(sub_args) => cmd_branch_set(ui, command, sub_args),
         BranchSubcommand::Delete(sub_args) => cmd_branch_delete(ui, command, sub_args),
         BranchSubcommand::Forget(sub_args) => cmd_branch_forget(ui, command, sub_args),
@@ -301,6 +320,42 @@ fn cmd_branch_create(
     Ok(())
 }
 
+fn cmd_branch_rename(
+    ui: &mut Ui,
+    command: &CommandHelper,
+    args: &BranchRenameArgs,
+) -> Result<(), CommandError> {
+    let mut workspace_command = command.workspace_helper(ui)?;
+    let target_commit =
+        workspace_command.resolve_single_rev(args.revision.as_deref().unwrap_or("@"), ui)?;
+    let repo = workspace_command.repo().as_ref();
+    let new_branch = &args.new;
+    let new_target = repo.view().get_local_branch(new_branch);
+    if !new_target.is_absent() {
+        return Err(user_error_with_hint(
+            format!("Branch name conflict: {new_branch}"),
+            "Target branch name already exists.",
+        ));
+    }
+
+    let old_branch = &args.old;
+    let mut tx = workspace_command.start_transaction();
+    tx.mut_repo()
+        .set_local_branch_target(new_branch, RefTarget::normal(target_commit.id().clone()));
+    tx.mut_repo()
+        .set_local_branch_target(old_branch, RefTarget::absent());
+    tx.finish(
+        ui,
+        format!(
+            "rename {} to {}; still point to commit {}",
+            make_branch_term(&[old_branch]),
+            make_branch_term(&[new_branch]),
+            target_commit.id().hex()
+        ),
+    )?;
+    Ok(())
+}
+
 fn cmd_branch_set(
     ui: &mut Ui,
     command: &CommandHelper,