diff --git a/scripts/delete-gone-branches.sh b/scripts/delete-gone-branches.sh
new file mode 100755
index 00000000..fed8f691
--- /dev/null
+++ b/scripts/delete-gone-branches.sh
@@ -0,0 +1,80 @@
+#!/bin/bash
+
+set -euo pipefail
+
+usage() {
+  cat <<'EOF'
+Usage: bash scripts/delete-gone-branches.sh [--apply]
+
+Find local branches whose upstream is marked "[gone]" and delete them.
+
+Options:
+  --apply    Actually delete the branches with `git branch -D`
+  --help     Show this help text
+
+Without --apply, the script prints what it would delete.
+EOF
+}
+
+apply=false
+
+case "${1:-}" in
+  "")
+    ;;
+  --apply)
+    apply=true
+    ;;
+  --help|-h)
+    usage
+    exit 0
+    ;;
+  *)
+    echo "Unknown option: $1" >&2
+    usage >&2
+    exit 1
+    ;;
+esac
+
+git fetch --prune --quiet
+
+mapfile -t gone_branches < <(
+  git for-each-ref --format='%(refname:short) %(upstream:track)' refs/heads |
+    while IFS= read -r line; do
+      branch=${line% *}
+      tracking=${line#"$branch "}
+      if [[ "$tracking" == "[gone]" ]]; then
+        printf '%s\n' "$branch"
+      fi
+    done
+)
+
+if [[ ${#gone_branches[@]} -eq 0 ]]; then
+  echo "No local branches with gone upstreams found."
+  exit 0
+fi
+
+current_branch="$(git branch --show-current)"
+
+echo "Found ${#gone_branches[@]} branch(es) with gone upstreams:"
+printf '  %s\n' "${gone_branches[@]}"
+
+if [[ "$apply" != true ]]; then
+  echo
+  echo "Dry run only. Re-run with --apply to delete them."
+  exit 0
+fi
+
+deleted_count=0
+
+for branch in "${gone_branches[@]}"; do
+  if [[ "$branch" == "$current_branch" ]]; then
+    echo "Skipping current branch: $branch"
+    continue
+  fi
+
+  git branch -D "$branch"
+  deleted_count=$((deleted_count + 1))
+done
+
+echo
+echo "Deleted $deleted_count branch(es)."