diff --git a/.github/workflows/presubmit-bun.yml b/.github/workflows/presubmit-bun.yml
new file mode 100644
index 00000000000..271d01c9b15
--- /dev/null
+++ b/.github/workflows/presubmit-bun.yml
@@ -0,0 +1,34 @@
+permissions:
+  contents: read
+
+on:
+  pull_request:
+name: presubmit-bun
+jobs:
+  units:
+    name: units (Node ${{ matrix.node-version }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [22, 24, 26]
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
+        with:
+          persist-credentials: false
+      # Node.js is required by npm for installing dependencies. 
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7
+        with:
+          node-version: ${{ matrix.node-version }}
+      # We continue to use npm (rather than Bun) for installation for consistent 
+      # lockfile/version management between CI/runtimes.
+      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0
+        with:
+          bun-version: 1.3.14
+      - run: bun --version
+      - run: npm install
+      - run: bun run test
+        name: Run unit tests with Bun
+        env:
+          MOCHA_THROW_DEPRECATION: false