diff --git a/.github/workflows/CompletePipeline.yml b/.github/workflows/CompletePipeline.yml
index de40f62a..d0fca361 100644
--- a/.github/workflows/CompletePipeline.yml
+++ b/.github/workflows/CompletePipeline.yml
@@ -143,6 +143,11 @@ on:
         required: false
         default: 'true'
         type: string
+      pypi_dry_run:
+        description: 'Validate the packages with twine, but do not upload them to PyPI.'
+        required: false
+        default: 'false'
+        type: string
       cleanup:
         description: 'Cleanup artifacts afterwards.'
         required: false
@@ -537,6 +542,7 @@ jobs:
       python_version: ${{ needs.UnitTestingParams.outputs.python_version }}
       requirements:   '-r dist/requirements.txt'
       artifact:       ${{ fromJson(needs.UnitTestingParams.outputs.artifact_names).package_all }}
+      dry_run:        ${{ inputs.pypi_dry_run }}
       cleanup:        ${{ inputs.cleanup }}
     secrets:
       PYPI_TOKEN:     ${{ secrets.PYPI_TOKEN }}
diff --git a/.github/workflows/PublishOnPyPI.yml b/.github/workflows/PublishOnPyPI.yml
index 0411235c..1628f106 100644
--- a/.github/workflows/PublishOnPyPI.yml
+++ b/.github/workflows/PublishOnPyPI.yml
@@ -44,6 +44,11 @@ on:
         description: 'Name of the package artifact.'
         required: true
         type: string
+      dry_run:
+        description: 'Validate the packages with twine, but do not upload them to PyPI.'
+        required: false
+        default: 'false'
+        type: string
       cleanup:
         description: 'Cleanup artifacts afterwards.'
         required: false
@@ -74,13 +79,19 @@ jobs:
       - name: ⚙ Install dependencies for packaging and release
         run: python -m pip install --disable-pip-version-check ${{ inputs.requirements }}
 
+      - name: 🔎 Check Python packages instead of publishing them
+        if: inputs.dry_run == 'true'
+        run: twine check dist/*.whl dist/*.tar.gz
+
       - name: ⤴ Publish Python wheel package to PyPI
+        if: inputs.dry_run != 'true'
         env:
           TWINE_USERNAME: __token__
           TWINE_PASSWORD: ${{ secrets.PYPI_TOKEN }}
         run: twine upload dist/*.whl
 
       - name: ⤴ Publish Python source package to PyPI
+        if: inputs.dry_run != 'true'
         env:
           TWINE_USERNAME: __token__
           TWINE_PASSWORD: ${{ secrets.PYPI_TOKEN }}
diff --git a/doc/JobTemplate/AllInOne/CompletePipeline.rst b/doc/JobTemplate/AllInOne/CompletePipeline.rst
index d5e946dd..90d846de 100644
--- a/doc/JobTemplate/AllInOne/CompletePipeline.rst
+++ b/doc/JobTemplate/AllInOne/CompletePipeline.rst
@@ -471,6 +471,8 @@ Parameter Summary
 +--------------------------------------------------------------------+----------+--------+----------------------------------------------------------------------------+
 | :ref:`JOBTMPL/CompletePipeline/Input/dorny`                        | no       | string | ``'false'``                                                                |
 +--------------------------------------------------------------------+----------+--------+----------------------------------------------------------------------------+
+| :ref:`JOBTMPL/CompletePipeline/Input/pypi_dry_run`                 | no       | string | ``'false'``                                                                |
++--------------------------------------------------------------------+----------+--------+----------------------------------------------------------------------------+
 | :ref:`JOBTMPL/CompletePipeline/Input/cleanup`                      | no       | string | ``'true'``                                                                 |
 +--------------------------------------------------------------------+----------+--------+----------------------------------------------------------------------------+
 
@@ -932,6 +934,23 @@ auto_tag
                   ``'false'`` - never tag automatically.
 
 
+.. _JOBTMPL/CompletePipeline/Input/pypi_dry_run:
+
+pypi_dry_run
+============
+
+:Type:            string
+:Required:        no
+:Default Value:   ``'false'``
+:Possible Values: ``'true'`` / ``'false'``
+:Description:     Validate the built packages with ``twine check`` instead of uploading them to :term:`PyPI`.
+                  Forwarded to :ref:`JOBTMPL/PublishOnPyPI/Input/dry_run`. |br|
+                  Intended for a pipeline that builds a package which is never published - a fixture used to
+                  exercise the job templates, or a fork that must not push to the upstream project's PyPI name. |br|
+                  ``'true'`` - check the packages and publish nothing. |br|
+                  ``'false'`` - publish the packages.
+
+
 .. _JOBTMPL/CompletePipeline/Input/cleanup:
 
 cleanup
diff --git a/doc/JobTemplate/Package/PublishOnPyPI.rst b/doc/JobTemplate/Package/PublishOnPyPI.rst
index af026860..a7ed8bdd 100644
--- a/doc/JobTemplate/Package/PublishOnPyPI.rst
+++ b/doc/JobTemplate/Package/PublishOnPyPI.rst
@@ -22,6 +22,9 @@ Publish a wheel (``*.whl``) packages and/or source (``*.tar.gz``) package to :te
       (:ref:`JOBTMPL/PublishOnPyPI/Input/requirements`), which must provide :term:`twine`.
    3. Publish the wheel package(s) (:file:`*.whl`).
    4. Publish the source package(s) (:file:`*.tar.gz`).
+
+      Steps 3 and 4 are replaced by a ``twine check`` of both package kinds if
+      :ref:`JOBTMPL/PublishOnPyPI/Input/dry_run` is enabled.
    5. Delete the artifact (:ref:`JOBTMPL/PublishOnPyPI/Input/cleanup`).
 
 .. topic:: Preconditions
@@ -125,6 +128,8 @@ Parameter Summary
 +---------------------------------------------------------+----------+--------+-------------------+
 | :ref:`JOBTMPL/PublishOnPyPI/Input/artifact`             | yes      | string | — — — —           |
 +---------------------------------------------------------+----------+--------+-------------------+
+| :ref:`JOBTMPL/PublishOnPyPI/Input/dry_run`              | no       | string | ``'false'``       |
++---------------------------------------------------------+----------+--------+-------------------+
 | :ref:`JOBTMPL/PublishOnPyPI/Input/cleanup`              | no       | string | ``'true'``        |
 +---------------------------------------------------------+----------+--------+-------------------+
 
@@ -182,6 +187,22 @@ artifact
 :Description:     Name of the artifact containing the packaged Python package(s).
 
 
+.. _JOBTMPL/PublishOnPyPI/Input/dry_run:
+
+dry_run
+=======
+
+:Type:            string
+:Required:        no
+:Default Value:   ``'false'``
+:Possible Values: ``'true'`` / ``'false'``
+:Description:     Validate the packages with ``twine check`` instead of uploading them to :term:`PyPI`. |br|
+                  Everything up to the upload still runs, so the artifact download, the Python setup and the package
+                  metadata are exercised - only the two ``twine upload`` calls are skipped. |br|
+                  ``'true'`` - check the packages and publish nothing. |br|
+                  ``'false'`` - publish the packages.
+
+
 .. _JOBTMPL/PublishOnPyPI/Input/cleanup:
 
 cleanup