diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 2f4faae8..5ea5f3d7 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -7,6 +7,11 @@ on:
 
 jobs:
   release:
+    # Do not run this job for pull requests where both branches are from the same repo.
+    # Jobs that depend on this one will be skipped too.
+    # This prevents duplicate CI runs for our own pull requests, whilst preserving the ability to
+    # run the CI for each branch push to a fork, and for each pull request originating from a fork.
+    if: github.event_name == 'push' || github.event.pull_request.head.repo.id != github.event.pull_request.base.repo.id
     permissions:
       contents: write
     runs-on: ubuntu-latest