diff --git a/.github/sync-repo-settings.yaml b/.github/sync-repo-settings.yaml
index c2f3673fcc..37874a6888 100644
--- a/.github/sync-repo-settings.yaml
+++ b/.github/sync-repo-settings.yaml
@@ -12,6 +12,7 @@ branchProtectionRules:
     - 'cla/google'
     - 'docs'
     - 'lint'
+    - 'mypy'
     - 'unit (3.9)'
     - 'unit (3.10)'
     - 'unit (3.11)'
diff --git a/.github/workflows/mypy.yml b/.github/workflows/mypy.yml
new file mode 100644
index 0000000000..e6a79291d0
--- /dev/null
+++ b/.github/workflows/mypy.yml
@@ -0,0 +1,22 @@
+on:
+  pull_request:
+    branches:
+      - main
+name: mypy
+jobs:
+  mypy:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Setup Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3.10"
+    - name: Install nox
+      run: |
+        python -m pip install --upgrade setuptools pip wheel
+        python -m pip install nox
+    - name: Run mypy
+      run: |
+        nox -s mypy
diff --git a/noxfile.py b/noxfile.py
index a08ef27781..bb2828faf4 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -145,7 +145,12 @@ def lint(session):
     Returns a failure if the linters find linting errors or sufficiently
     serious code quality issues.
     """
-    session.install("flake8", BLACK_VERSION)
+    session.install("flake8", BLACK_VERSION, ISORT_VERSION)
+    session.run(
+        "isort",
+        "--check",
+        *LINT_PATHS,
+    )
     session.run(
         "black",
         "--check",