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diff --git a/var/spack/repos/builtin/packages/geomodel/package.py b/var/spack/repos/builtin/packages/geomodel/package.py
new file mode 100644
index 0000000000..3fb17ff571
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+++ b/var/spack/repos/builtin/packages/geomodel/package.py
@@ -0,0 +1,75 @@
+# 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 Geomodel(CMakePackage):
+    """GeoModel is a user-friendly C++ Toolkit and Suite for
+    HEP Detector Description with minimal dependencies."""
+
+    homepage = "https://gitlab.cern.ch/GeoModelDev/GeoModel"
+    url = "https://gitlab.cern.ch/GeoModelDev/GeoModel/-/archive/4.6.0/GeoModel-4.6.0.tar.bz2"
+    git = "https://gitlab.cern.ch/GeoModelDev/GeoModel"
+
+    maintainers("wdconinc")
+
+    license("Apache-2.0", checked_by="wdconinc")
+
+    version("4.6.0", sha256="d827dc79a5555fd7b09d1b670fc6f01f91476d0edf98ccd644c624f18fb729ca")
+
+    variant(
+        "visualization", default=False, description="Enable the build of GeoModelVisualization"
+    )
+    variant("geomodelg4", default=False, description="Enable the build of GeoModelG4")
+    variant("fullsimlight", default=False, description="Enable the build of FullSimLight")
+    variant("fsl", default=False, description="Enable the build of FSL and FullSimLight")
+    variant("examples", default=False, description="Enable the build of GeoModelExamples")
+    variant("tools", default=False, description="Enable the build of GeoModelTools")
+    variant(
+        "hepmc3",
+        default=False,
+        description="Build GeoModel tools with support for the HepMC3 exchange format",
+        when="+fullsimlight",
+    )
+    variant(
+        "pythia",
+        default=False,
+        description="Build GeoModel tools with support for the Pythia event generator",
+        when="+fullsimlight",
+    )
+
+    conflicts("+fullsimlight", when="+fsl", msg="FSL triggers the build of the FullSimLight")
+
+    depends_on("cmake@3.16:", type="build")
+
+    depends_on("eigen@3.2.9:")
+    depends_on("nlohmann-json@3.6.1:")
+    depends_on("sqlite@3.7.17:")
+    depends_on("xerces-c@3.2.3:")
+
+    depends_on("geant4", when="+geomodelg4")
+    depends_on("geant4", when="+fullsimlight")
+    depends_on("hepmc3", when="+hepmc3")
+    depends_on("pythia8", when="+pythia")
+    with when("+visualization"):
+        depends_on("hdf5")
+        depends_on("qt-base +gui +opengl +sql +widgets")
+        depends_on("opengl")
+
+    def cmake_args(self):
+        def cmake_variant(cmake_label, spack_variant):
+            enabled = spec.satisfies("+" + spack_variant)
+            return f"-DGEOMODEL_BUILD_{cmake_label}={enabled}"
+
+        args = [
+            cmake_variant("VISUALIZATION", "visualization"),
+            cmake_variant("GEOMODELG4", "geomodelg4"),
+            cmake_variant("FULLSIMLIGHT", "fullsimlight"),
+            cmake_variant("FSL", "fsl"),
+            cmake_variant("EXAMPLES", "examples"),
+            cmake_variant("TOOLS", "tools"),
+        ]
+        return args