diff --git a/var/spack/repos/builtin/packages/py-postcactus/package.py b/var/spack/repos/builtin/packages/py-postcactus/package.py
new file mode 100644
index 0000000000..b33fcbd40a
--- /dev/null
+++ b/var/spack/repos/builtin/packages/py-postcactus/package.py
@@ -0,0 +1,40 @@
+# Copyright 2013-2024 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack.package import *
+
+
+class PyPostcactus(PythonPackage):
+    """This repository contains a Python package named PostCactus for
+    postprocessing data from numerical simulations performed with the Einstein
+    Toolkit."""
+
+    homepage = "https://github.com/wokast/PyCactus"
+    url = "https://github.com/wokast/PyCactus/archive/refs/tags/2.2.zip"
+
+    version("2.2", sha256="303108835d7652b37f43871c735b99dc7a60c28a24de35a09e9d2bb0f28f93fb")
+
+    # pyproject.toml
+    depends_on("py-setuptools@40.6.0:", type="build")
+    # setup.cfg
+    depends_on("py-h5py", type=("build", "run"))
+    depends_on("py-numpy", type=("build", "run"))
+    depends_on("py-scipy", type=("build", "run"))
+    depends_on("py-future", type=("build", "run"))
+    depends_on("py-matplotlib", type=("build", "run"))
+    depends_on("py-tables", type=("build", "run"))
+    depends_on("py-jupyter", type=("build", "run"), when="+jupyter")
+    depends_on("vtk", type=("build", "run"), when="+vtk")
+
+    # Variants for the optional requirements in README.md
+    variant("jupyter", default=False, description="Support for jupyter")
+    variant("vtk", default=False, description="VTK for 3D plots")
+
+    def patch(self):
+        # Commenting out build-backend in order to ignore a ModuleNotFoundError
+        # for setuptools.build-meta
+        filter_file("^build-backend", "# build-backend", "PostCactus/pyproject.toml")
+
+    build_directory = "PostCactus"