diff --git a/pkgs/development/python-modules/orjson/default.nix b/pkgs/development/python-modules/orjson/default.nix
new file mode 100644
index 000000000000..55fbb2df8e25
--- /dev/null
+++ b/pkgs/development/python-modules/orjson/default.nix
@@ -0,0 +1,61 @@
+{ lib
+, stdenv
+, pythonOlder
+, rustPlatform
+, fetchFromGitHub
+, buildPythonPackage
+, libiconv
+, numpy
+, psutil
+, pytestCheckHook
+, python-dateutil
+, pytz
+, xxhash
+}:
+
+buildPythonPackage rec {
+  pname = "orjson";
+  version = "3.6.3";
+  disabled = pythonOlder "3.7";
+
+  src = fetchFromGitHub {
+    owner = "ijl";
+    repo = pname;
+    rev = version;
+    sha256 = "10clf13bp3fqd9b7n1isrfwz7sngcl1j6birqc1xyg9wzfw1kslj";
+  };
+
+  cargoDeps = rustPlatform.fetchCargoTarball {
+    inherit src;
+    name = "${pname}-${version}";
+    sha256 = "163rf8k7qb1whjf78i8v5dlyif1sgvd9xkj8li81j45abgzkq86w";
+  };
+
+  format = "pyproject";
+
+  nativeBuildInputs = with rustPlatform; [
+    cargoSetupHook
+    maturinBuildHook
+  ];
+
+  buildInputs = lib.optionals stdenv.isDarwin [ libiconv ];
+
+  checkInputs = [
+    numpy
+    psutil
+    pytestCheckHook
+    python-dateutil
+    pytz
+    xxhash
+  ];
+
+  pythonImportsCheck = [ pname ];
+
+  meta = with lib; {
+    description = "Fast, correct Python JSON library supporting dataclasses, datetimes, and numpy";
+    homepage = "https://github.com/ijl/orjson";
+    license = with licenses; [ asl20 mit ];
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ misuzu ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 19ee538be2d8..8f6e567cf3be 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -5162,6 +5162,8 @@ in {
 
   orderedset = callPackage ../development/python-modules/orderedset { };
 
+  orjson = callPackage ../development/python-modules/orjson { };
+
   orm = callPackage ../development/python-modules/orm { };
 
   ortools = (toPythonModule (pkgs.or-tools.override { inherit (self) python; })).python;