diff --git a/.github/workflows/test-action-kustomize.yml b/.github/workflows/test-action-kustomize.yml
new file mode 100644
index 0000000..c51ca1a
--- /dev/null
+++ b/.github/workflows/test-action-kustomize.yml
@@ -0,0 +1,64 @@
+name: Action CI (Kustomize)
+
+on: [push]
+
+jobs:
+  test-action-kustomize-job-win32:
+    runs-on: windows-latest
+    name: kube-score kustomize (Win32)
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - uses: azure/setup-kubectl@v3
+        id: install
+      - name: Make temporal output directory
+        run: mkdir -p out/kustomize
+      - name: kustomize build to standard template
+        run: kubectl kustomize sample-manifests\kustomize\overlays\production > ./out/kustomize/sample-kustomize.yaml
+      - name: kube-score action step
+        uses: ./ # Uses an action in the root directory
+        id: ksga
+        with:
+          manifests-folders: './out/kustomize/*.yaml'
+          ignore-exit-code: 'true'
+          kube-score-version: '1.14.0'
+
+  test-action-kustomize-job-linux:
+    runs-on: ubuntu-latest
+    name: kube-score kustomize (Linux)
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - uses: azure/setup-kubectl@v3
+        id: install
+      - name: Make temporal output directory
+        run: mkdir -p out/kustomize
+      - name: kustomize build to standard template
+        run: kubectl kustomize sample-manifests/kustomize/overlays/production > ./out/kustomize/sample-kustomize.yaml
+      - name: kube-score action step
+        uses: ./ # Uses an action in the root directory
+        id: ksga
+        with:
+          manifests-folders: './out/kustomize/*.yaml'
+          ignore-exit-code: 'true'
+          kube-score-version: '1.14.0'
+
+  test-action-kustomize-job-macos:
+    runs-on: macos-latest
+    name: kube-score kustomize (MacOS)
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - uses: azure/setup-kubectl@v3
+        id: install
+      - name: Make temporal output directory
+        run: mkdir -p out/kustomize
+      - name: kustomize build to standard template
+        run: kubectl kustomize sample-manifests/kustomize/overlays/production > ./out/kustomize/sample-kustomize.yaml
+      - name: kube-score action step
+        uses: ./ # Uses an action in the root directory
+        id: ksga
+        with:
+          manifests-folders: './out/kustomize/*.yaml'
+          ignore-exit-code: 'true'
+          kube-score-version: '1.14.0'
diff --git a/sample-manifests/kustomize/base/deployment.yaml b/sample-manifests/kustomize/base/deployment.yaml
new file mode 100644
index 0000000..77faefc
--- /dev/null
+++ b/sample-manifests/kustomize/base/deployment.yaml
@@ -0,0 +1,21 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+  labels:
+    app: nginx
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:1.7.9
+        ports:
+        - containerPort: 80
\ No newline at end of file
diff --git a/sample-manifests/kustomize/base/kustomization.yaml b/sample-manifests/kustomize/base/kustomization.yaml
new file mode 100644
index 0000000..d4abebb
--- /dev/null
+++ b/sample-manifests/kustomize/base/kustomization.yaml
@@ -0,0 +1,4 @@
+commonLabels:
+  app: hello
+resources:
+- deployment.yaml
\ No newline at end of file
diff --git a/sample-manifests/kustomize/overlays/production/kustomization.yaml b/sample-manifests/kustomize/overlays/production/kustomization.yaml
new file mode 100644
index 0000000..0c17158
--- /dev/null
+++ b/sample-manifests/kustomize/overlays/production/kustomization.yaml
@@ -0,0 +1,6 @@
+commonLabels:
+  env: production
+bases:
+- ../../base
+patches:
+- replica_count.yaml
diff --git a/sample-manifests/kustomize/overlays/production/replica_count.yaml b/sample-manifests/kustomize/overlays/production/replica_count.yaml
new file mode 100644
index 0000000..612b301
--- /dev/null
+++ b/sample-manifests/kustomize/overlays/production/replica_count.yaml
@@ -0,0 +1,6 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+spec:
+  replicas: 100
\ No newline at end of file