diff --git a/ci-templates/github/model-validation/action.yml b/ci-templates/github/model-validation/action.yml
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@@ -0,0 +1,54 @@
+# SPDX-FileCopyrightText: Copyright DB Netz AG and the capella-collab-manager contributors
+# SPDX-License-Identifier: Apache-2.0
+
+name: "Capella Model-Validation"
+description: "An action to validate a Capella model."
+
+inputs:
+  entry_point:
+    description: "The entry point of the used model"
+  capella_docker_images_revision:
+    description: "The revision of capella-dockerimages to use"
+    default: main
+  capella_docker_images_dropins:
+    description: "Please have a look at https://dsd-dbs.github.io/capella-dockerimages/capella/introduction/#supported-dropins"
+    required: false
+    default: selected
+
+runs:
+  using: "composite"
+  steps:
+    - name: Set up Python 3.11
+      uses: actions/setup-python@v3
+      with:
+        python-version: 3.11
+    - name: Extract branch name and print
+      shell: bash
+      run: echo "Branch is $(echo ${{ github.ref }} | cut -d'/' -f3)"
+    - name: Execute Model-Validation with Capella CLI
+      shell: bash
+      run: >
+        # As our containers run with techuser (non-root) git commands fail with dubious ownership, see <https://gitlab.com/gitlab-org/gitlab-runner/-/issues/29022> for the solution.
+        - git config --global --add safe.directory ${CI_PROJECT_DIR}
+        - git fetch
+        - if [ ! -z $CI_COMMIT_BRANCH ]; then git reset --hard origin/$CI_COMMIT_BRANCH; fi
+        - BUILD_DIR=$(pwd)
+        - if [ ! -f ".project" ]; then echo "The model validator requires a '.project' file!" && exit 1; fi
+        - 'if [[ "$(dirname "{{ inputs.entry_point }}")" != "." ]]; then echo ''The model validator requires a "*.aird" in the root level of the repository!'' && exit 1; fi'
+        - mkdir /tmp/project
+        - cp -r . /tmp/project
+        - cd /tmp
+        - >
+            xvfb-run /opt/capella/capella
+            -nosplash
+            -application org.polarsys.capella.core.commandline.core
+            -appid org.polarsys.capella.core.validation.commandline
+            -data "$(pwd)"
+            -input "project/{{ inputs.entry_point }}"
+            -outputfolder "project/validation"
+        - cp "/tmp/project/validation/project/{{ inputs.entry_point }}/validation-results.html" $BUILD_DIR
+    - name: Archive model-validation in artifacts
+      uses: actions/upload-artifact@v3
+      with:
+        name: Validation reports
+        path: $(pwd)