diff --git a/.github/workflows/build-cran-source.yaml b/.github/workflows/build-cran-source.yaml
new file mode 100644
index 0000000..f1d7c94
--- /dev/null
+++ b/.github/workflows/build-cran-source.yaml
@@ -0,0 +1,35 @@
+name: Build CRAN source
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: r-lib/actions/setup-pandoc@v2
+
+      - uses: r-lib/actions/setup-r@v2
+        with:
+          r-version: release
+          use-public-rspm: true
+
+      - uses: r-lib/actions/setup-r-dependencies@v2
+        with:
+          needs: check
+
+      - name: Build CRAN source tarball
+        run: R CMD build . --compact-vignettes=gs+qpdf
+
+      - name: Upload CRAN source tarball
+        uses: actions/upload-artifact@v4
+        with:
+          name: foundryR-cran-source
+          path: foundryR_*.tar.gz
+          if-no-files-found: error