diff --git a/pkgs/development/python-modules/optax/default.nix b/pkgs/development/python-modules/optax/default.nix
new file mode 100644
index 000000000000..bf0383fa1530
--- /dev/null
+++ b/pkgs/development/python-modules/optax/default.nix
@@ -0,0 +1,55 @@
+{ absl-py
+, buildPythonPackage
+, chex
+, dm-haiku
+, fetchFromGitHub
+, jaxlib
+, lib
+, numpy
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "optax";
+  # As of 2022-01-06, the latest stable version (0.1.0) has broken tests that are fixed
+  # in https://github.com/deepmind/optax/commit/d6633365d84eb6f2c0df0c52b630481a349ce562
+  version = "unstable-2022-01-05";
+
+  src = fetchFromGitHub {
+    owner = "deepmind";
+    repo = pname;
+    rev = "5ec5541b3486224b22e950480ff639ceaf5098f7";
+    sha256 = "1q8cxc42a5xais2ll1l238cnn3l7w28savhgiz0lg01ilz2ysbli";
+  };
+
+  propagatedBuildInputs = [
+    absl-py
+    chex
+    jaxlib
+    numpy
+  ];
+
+  checkInputs = [
+    dm-haiku
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [
+    "optax"
+  ];
+
+  disabledTestPaths = [
+    # Requires `flax` which depends on `optax` creating circular dependency.
+    "optax/_src/equivalence_test.py"
+    # Require `tensorflow_datasets` which isn't packaged in `nixpkgs`.
+    "examples/datasets_test.py"
+    "examples/lookahead_mnist_test.py"
+  ];
+
+  meta = with lib; {
+    description = "Optax is a gradient processing and optimization library for JAX.";
+    homepage = "https://github.com/deepmind/optax";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ ndl ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 622dbecc206a..e2d2b193f864 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -5600,6 +5600,8 @@ in {
 
   opt-einsum = callPackage ../development/python-modules/opt-einsum { };
 
+  optax = callPackage ../development/python-modules/optax { };
+
   optuna = callPackage ../development/python-modules/optuna { };
 
   opuslib = callPackage ../development/python-modules/opuslib { };