diff --git a/.github/workflows/osx.yaml b/.github/workflows/osx.yaml
new file mode 100644
index 0000000000..0035faa228
--- /dev/null
+++ b/.github/workflows/osx.yaml
@@ -0,0 +1,72 @@
+name: Parsl
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+
+jobs:
+  main-test-suite:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 60
+
+    steps:
+    - uses: actions/checkout@master
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Collect Job Information
+      id: job-info
+      run: |
+        echo "Python Version: ${{ matrix.python-version }}" >> ci_job_info.txt
+        echo "CI Triggering Event: ${{ github.event_name }}" >> ci_job_info.txt
+        echo "Triggering Git Ref: ${{ github.ref }}" >> ci_job_info.txt
+        echo "Triggering Git SHA: ${{ github.sha }}" >> ci_job_info.txt
+        echo "Workflow Run: ${{ github.run_number }}" >> ci_job_info.txt
+        echo "Workflow Attempt: ${{ github.run_attempt }}" >> ci_job_info.txt
+        as_ascii="$(echo "${{ github.ref_name }}" | perl -pe "s/[^A-z0-9-]+/-/g; s/^-+|-+\$//g; s/--+/-/g;")"
+        echo "as-ascii=$as_ascii" >> $GITHUB_OUTPUT
+
+    - name: Non-requirements based install
+      run: |
+        brew install mpich
+
+    - name: setup virtual env
+      run: |
+        python -m venv .venv
+        source .venv/bin/activate
+
+    - name: Install Parsl and dependencies
+      run: |
+        source .venv/bin/activate
+        pip install -r requirements.txt
+        pip install -r test-requirements.txt
+
+    - name: make test
+      run: |
+        source .venv/bin/activate
+        export PARSL_TEST_PRESERVE_NUM_RUNS=7
+        make test
+
+    - name: Documentation checks
+      run: |
+        source .venv/bin/activate
+        pip install .[docs]
+        brew install pandoc
+        cd docs
+        test ! -e stubs
+        PYTHONPATH=/tmp/cctools/lib/python3.8/site-packages make SPHINXOPTS=-W html
+        cd ..
+        ! grep ERROR .pytest/parsltest-current/runinfo*/*/database_manager.log
+        ! grep ERROR .pytest/parsltest-current/runinfo*/*/monitoring_router.log
+        rm -f .pytest/parsltest-current test_runinfo
+        
\ No newline at end of file
diff --git a/parsl/executors/high_throughput/process_worker_pool.py b/parsl/executors/high_throughput/process_worker_pool.py
index 0a2bc513dd..574c694ae0 100755
--- a/parsl/executors/high_throughput/process_worker_pool.py
+++ b/parsl/executors/high_throughput/process_worker_pool.py
@@ -675,9 +675,10 @@ def worker(
     # If desired, set process affinity
     if cpu_affinity != "none":
         # Count the number of cores per worker
-        avail_cores = sorted(os.sched_getaffinity(0))  # Get the available threads
-        cores_per_worker = len(avail_cores) // pool_size
-        assert cores_per_worker > 0, "Affinity does not work if there are more workers than cores"
+        if platform.system() == "Linux":
+            avail_cores = sorted(os.sched_getaffinity(0))  # Get the available threads
+            cores_per_worker = len(avail_cores) // pool_size
+            assert cores_per_worker > 0, "Affinity does not work if there are more workers than cores"
 
         # Determine this worker's cores
         if cpu_affinity == "block":