diff --git a/.github/workflows/flatpak-template.yml b/.github/workflows/flatpak-template.yml
new file mode 100644
index 00000000000..773bc489f97
--- /dev/null
+++ b/.github/workflows/flatpak-template.yml
@@ -0,0 +1,30 @@
+name: Flatpak Build
+
+on:
+  workflow_call:
+    inputs:
+      arch:
+        required: true
+        type: string
+      runner_labels:
+        required: true
+        type: string
+
+jobs:
+  flatpak:
+    runs-on: ${{ fromJSON(inputs.runner_labels) }}
+
+    container:
+      image: ghcr.io/flathub-infra/flatpak-github-actions:kde-6.9
+      options: --privileged
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: flatpak/flatpak-github-actions/flatpak-builder@v6
+        with:
+          bundle: Ladybird.flatpak
+          manifest-path: Meta/CMake/flatpak/org.ladybird.Ladybird.json
+          cache: 'true'
+          arch: ${{ inputs.arch }}
+          # Note: default cache key is 'flatpak-builder-${arch}-${sha256(manifestPath)}'
+          upload-artifact: 'true'
diff --git a/.github/workflows/nightly-lagom.yml b/.github/workflows/nightly-lagom.yml
index 5850c4d65ee..201c5d3731e 100644
--- a/.github/workflows/nightly-lagom.yml
+++ b/.github/workflows/nightly-lagom.yml
@@ -77,3 +77,22 @@ jobs:
       arch: ${{ matrix.arch }}
       build_preset: ${{ matrix.build_preset }}
       clang_plugins: ${{ matrix.clang_plugins }}
+
+  flatpak:
+    if: github.repository == 'LadybirdBrowser/ladybird'
+    name: Flatpak ${{ matrix.arch }}
+    strategy:
+      fail-fast: false
+      matrix:
+        arch: [ 'x86_64' ]
+        runner_labels: [ '["blacksmith-8vcpu-ubuntu-2404"]' ]
+
+        include:
+          - arch: 'aarch64'
+            runner_labels: '["blacksmith-8vcpu-ubuntu-2404-arm"]'
+
+    secrets: inherit
+    uses: ./.github/workflows/flatpak-template.yml
+    with:
+      arch: ${{ matrix.arch }}
+      runner_labels: ${{ matrix.runner_labels }}