diff --git a/pkgs/development/python-modules/in-n-out/default.nix b/pkgs/development/python-modules/in-n-out/default.nix
new file mode 100644
index 000000000000..2d0cc4be92cd
--- /dev/null
+++ b/pkgs/development/python-modules/in-n-out/default.nix
@@ -0,0 +1,49 @@
+{ lib
+, buildPythonPackage
+, cython_3
+, fetchPypi
+, future
+, pytestCheckHook
+, pythonOlder
+, setuptools
+, setuptools-scm
+}:
+
+buildPythonPackage rec {
+  pname = "in-n-out";
+  version = "0.1.6";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.8";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "sha256-PuzjidORMFVlmFZbmnu9O92FoiuXrC8NNRyjwdodriY=";
+  };
+
+  nativeBuildInputs = [
+    cython_3
+    setuptools
+    setuptools-scm
+  ];
+
+  propagatedBuildInputs = [
+    future
+  ];
+
+  nativeCheckInputs = [
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [
+    "in_n_out"
+  ];
+
+  meta = with lib; {
+    description = "Module for dependency injection and result processing";
+    homepage = "https://app-model.readthedocs.io/";
+    changelog = "https://github.com/pyapp-kit/in-n-out/blob/v${version}/CHANGELOG.md";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ fab ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index b0482f822498..c02e7c3c8e35 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -4638,6 +4638,8 @@ self: super: with self; {
 
   imutils = callPackage ../development/python-modules/imutils { };
 
+  in-n-out = callPackage ../development/python-modules/in-n-out { };
+
   in-place = callPackage ../development/python-modules/in-place { };
 
   incomfort-client = callPackage ../development/python-modules/incomfort-client { };