diff --git a/pkgs/development/python-modules/onnx/default.nix b/pkgs/development/python-modules/onnx/default.nix
new file mode 100644
index 00000000000000..3f3cf38f333207
--- /dev/null
+++ b/pkgs/development/python-modules/onnx/default.nix
@@ -0,0 +1,78 @@
+{ lib
+, fetchpatch
+, buildPythonPackage
+, fetchPypi
+, pythonOlder
+, isPy27
+, cmake
+, protobuf
+, numpy
+, six
+, typing-extensions
+, typing
+, pytestrunner
+, pytest
+, nbval
+, tabulate
+}:
+
+buildPythonPackage rec {
+  pname = "onnx";
+  version = "1.6.0";
+
+  # Due to Protobuf packaging issues this build of Onnx with Python 2 gives
+  # errors on import
+  disabled = isPy27;
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0ig33jl3591041lyylxp52yi20rfrcqx3i030hd6al8iabzc721v";
+  };
+
+  # Remove the unqualified requirement for the typing package for running the
+  # tests. typing is already required for the installation, where it is
+  # correctly qualified so as to only be required for sufficiently old Python
+  # versions.
+  # This patch should be in the next release (>1.6).
+  patches = [
+    (fetchpatch {
+      url = "https://github.com/onnx/onnx/commit/c963586d0f8dd5740777b2fd06f04ec60816de9f.patch";
+      sha256 = "1hl26cw5zckc91gmh0bdah87jyprccxiw0f4i5h1gwkq28hm6wbj";
+    })
+  ];
+
+  nativeBuildInputs = [ cmake ];
+
+  propagatedBuildInputs = [
+    protobuf
+    numpy
+    six
+    typing-extensions
+  ] ++ lib.optional (pythonOlder "3.5") [ typing ];
+
+  checkInputs = [
+    pytestrunner
+    pytest
+    nbval
+    tabulate
+  ];
+
+  postPatch = ''
+    patchShebangs tools/protoc-gen-mypy.py
+  '';
+
+  # The executables are just utility scripts that aren't too important
+  postInstall = ''
+    rm -r $out/bin
+  '';
+
+  # The setup.py does all the configuration (running CMake)
+  dontConfigure = true;
+
+  meta = {
+    homepage    = http://onnx.ai;
+    description = "Open Neural Network Exchange";
+    license     = lib.licenses.mit;
+    maintainers = [ lib.maintainers.acairncross ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index f314cffbb52c5a..2b2248f6943a8a 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -903,6 +903,8 @@ in {
 
   oauthenticator = callPackage ../development/python-modules/oauthenticator { };
 
+  onnx = callPackage ../development/python-modules/onnx { };
+
   ordered-set = callPackage ../development/python-modules/ordered-set { };
 
   ortools = (toPythonModule (pkgs.or-tools.override {