diff --git a/.github/workflows/cancel.yml b/.github/workflows/cancel.yml
new file mode 100644
index 0000000..e79a154
--- /dev/null
+++ b/.github/workflows/cancel.yml
@@ -0,0 +1,30 @@
+name: Cancel runs
+
+on:
+  delete:
+  pull_request:
+    types:
+      - closed
+
+permissions:
+  actions: write
+
+jobs:
+  cancel:
+    name: Cancel the runs of a closed branch
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request' || github.event.ref_type == 'branch'
+
+    steps:
+      - name: Cancel every queued or running workflow of the branch
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_REPO: ${{ github.repository }}
+          BRANCH: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.ref || github.event.ref }}
+        run: |
+          set -euo pipefail
+          gh run list --branch "${BRANCH}" --limit 100 \
+            --json databaseId,status \
+            --jq '.[] | select(.status != "completed") | .databaseId' \
+            | sed "/^${GITHUB_RUN_ID}$/d" \
+            | xargs -r -n1 gh run cancel