diff --git a/pkgs/development/libraries/opencascade-occt/7.3.nix b/pkgs/development/libraries/opencascade-occt/7.3.nix
new file mode 100644
index 00000000000..83b1cfc2add
--- /dev/null
+++ b/pkgs/development/libraries/opencascade-occt/7.3.nix
@@ -0,0 +1,28 @@
+{ stdenv, fetchurl, fetchpatch, cmake, ninja, tcl, tk,
+  libGL, libGLU, libXext, libXmu, libXi }:
+
+stdenv.mkDerivation rec {
+  pname = "opencascade-occt";
+  version = "7.3.0p3";
+  commit = "V${builtins.replaceStrings ["."] ["_"] version}";
+
+  src = fetchurl {
+    name = "occt-${commit}.tar.gz";
+    url = "https://git.dev.opencascade.org/gitweb/?p=occt.git;a=snapshot;h=${commit};sf=tgz";
+    sha256 = "0k9c3ypcnjcilq1dhsf6xxbd52gyq4h5rchvp30k3c8ph4ris5pz";
+  };
+
+  nativeBuildInputs = [ cmake ninja ];
+  buildInputs = [ tcl tk libGL libGLU libXext libXmu libXi ];
+
+  meta = with stdenv.lib; {
+    description = "Open CASCADE Technology, libraries for 3D modeling and numerical simulation";
+    homepage = "https://www.opencascade.org/";
+    license = licenses.lgpl21;  # essentially...
+    # The special exception defined in the file OCCT_LGPL_EXCEPTION.txt
+    # are basically about making the license a little less share-alike.
+    maintainers = with maintainers; [ amiloradovsky ];
+    platforms = platforms.all;
+  };
+
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 48a307f17b3..f2ca97695b4 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -14671,6 +14671,7 @@ in
     inherit (darwin.apple_sdk.frameworks) OpenCL Cocoa;
   };
   opencascade-occt = callPackage ../development/libraries/opencascade-occt { };
+  opencascade-occt730 = callPackage ../development/libraries/opencascade-occt/7.3.nix { };
 
   opencl-headers = callPackage ../development/libraries/opencl-headers { };