diff --git a/nongnu/packages/modelica.scm b/nongnu/packages/modelica.scm
new file mode 100644
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@@ -0,0 +1,120 @@
+(define-module (nongnu packages modelica)
+  #:use-module (guix packages)
+  #:use-module (guix git-download)
+  #:use-module (guix download)
+  #:use-module (guix gexp)
+  #:use-module (guix build-system cmake)
+  #:use-module ((guix licenses) #:prefix license:)
+
+  #:use-module (gnu packages autotools)
+  #:use-module (gnu packages boost)
+  #:use-module (gnu packages ccache)
+  #:use-module (gnu packages commencement)
+  #:use-module (gnu packages curl)
+  #:use-module (gnu packages documentation)
+  #:use-module (gnu packages graphics)
+  #:use-module (gnu packages graphviz)
+  #:use-module (gnu packages java)
+  #:use-module (gnu packages linux)
+  #:use-module (gnu packages maths)
+  #:use-module (gnu packages opencl)
+  #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages python)
+  #:use-module (gnu packages qt)
+  #:use-module (gnu packages readline)
+  #:use-module (gnu packages xml))
+
+(define ombootstrapping
+  (origin
+   (method url-fetch)
+   (uri "https://api.github.com/repos/OpenModelica/OMBootstrapping/tarball/c289e97c41d00939a4a69fe504961b47283a6d8e")
+   (sha256
+    (base32 "1drz4hh9xfp2n9ilr0cmxm0jka24swdnglh8av06rdp0b2f9xszi"))))
+
+(define-public openmodelica
+  (package
+   (name "openmodelica")
+   (version "1.22.4")
+   (source
+    (origin
+     (method git-fetch)
+     (uri (git-reference
+           (url "https://github.com/OpenModelica/OpenModelica")
+           (commit (string-append "v" version))
+           (recursive? #t)))
+     (sha256
+      (base32 "02g5i2clcnn16gmi8v11sfn23r291jpsqi98qqq6al3lmc1xp556"))
+     (snippet
+      (with-imported-modules
+       '((guix build utils))
+       #~(begin
+           (use-modules (guix build utils))
+           (substitute*
+            "OMCompiler/Compiler/boot/CMakeLists.txt"
+            (("https://github.com/OpenModelica/OMBootstrapping/archive/refs/heads/master.tar.gz")
+             (string-append "file://" #$ombootstrapping)))
+
+
+           (substitute*
+            "OMPlot/OMPlot/OMPlotGUI/CMakeLists.txt"
+            (("target_link_libraries\\(OMPlotLib PUBLIC omc::simrt::runtime\\)")
+             "target_link_libraries(OMPlotLib PUBLIC omc::simrt::runtime)
+find_package(Qt5Svg REQUIRED)
+INCLUDE_DIRECTORIES(${Qt5Svg_INCLUDE_DIRS})
+target_link_libraries(OMPlotLib PUBLIC Qt5Svg)
+")))))))
+
+   (build-system cmake-build-system)
+   (arguments
+    (list
+     #:validate-runpath? #f
+     ;; No tests
+     #:tests? #f
+     #:configure-flags
+     ''("-DOM_OMEDIT_ENABLE_QTWEBENGINE=ON")
+     #:phases
+     #~(modify-phases %standard-phases
+                      (add-before 'build 'create-home
+                                  (lambda _
+                                    (mkdir-p (string-append (getcwd) "/home"))
+                                    (setenv "HOME" (string-append (getcwd) "/home")))))))
+   (native-inputs
+    (list
+     ccache
+     doxygen
+     graphviz
+     autoconf
+     pkg-config))
+   (inputs
+    (list
+     expat
+     openscenegraph
+     readline
+     qtdeclarative-5
+     qtwebchannel-5
+     qtwebengine-5
+     qtxmlpatterns
+     qtsvg-5
+     qtbase-5
+     opencl-headers
+     opencl-icd-loader
+     boost
+     icedtea
+     (list util-linux "lib")
+     gfortran-toolchain
+     openblas
+     curl))
+   (home-page "https://openmodelica.org/")
+   (synopsis
+    "Open-source Modelica-based modeling and simulation environment")
+   (description
+    "OPENMODELICA is an open-source Modelica-based1 modeling and simulation
+environment intended for industrial and academic usage.
+
+The goal with the OpenModelica effort is to create a comprehensive Open Source
+Modelica modeling, compilation and simulation environment based on free software
+distributed in binary and source code form for research, teaching, and
+industrial usage.  We invite researchers and students, or any interested
+developer to participate in the project and cooperate around OpenModelica,
+tools, and applications.")
+   (license license:agpl3)))