diff --git a/pkgs/development/python-modules/sanic-ext/default.nix b/pkgs/development/python-modules/sanic-ext/default.nix
new file mode 100644
index 000000000000..581b44962816
--- /dev/null
+++ b/pkgs/development/python-modules/sanic-ext/default.nix
@@ -0,0 +1,75 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+
+  # Build system
+  setuptools,
+
+  # Dependencies
+  pyyaml,
+
+  # Test dependencies
+  pytestCheckHook,
+
+  sanic-testing,
+  attrs,
+  coverage,
+  msgspec,
+  pydantic,
+  pytest,
+  pytest-cov,
+  pytest-asyncio,
+  tox,
+  jinja2,
+}:
+
+buildPythonPackage rec {
+  pname = "sanic-ext";
+  version = "24.12.0";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "sanic-org";
+    repo = "sanic-ext";
+    tag = "v${version}";
+    hash = "sha256-H1tqiPQ4SwlNGj7GtB2h7noZpU+gbGXIbmRK1TSSqVA=";
+  };
+
+  build-system = [ setuptools ];
+
+  dependencies = [
+    pyyaml
+  ];
+
+  nativeCheckInputs = [
+    pytestCheckHook
+
+    sanic-testing
+    attrs
+    coverage
+    msgspec
+    pydantic
+    pytest
+    pytest-cov
+    pytest-asyncio
+    tox
+    jinja2
+  ];
+
+  disabledTests = [
+    "test_models[FooPydanticDataclass]" # KeyError: 'paths'
+    "test_pydantic_base_model[AlertResponsePydanticBaseModel-True]" # AssertionError: assert 'AlertPydanticBaseModel' in {'AlertResponsePydanticBaseModel': ... }
+    "test_pydantic_base_model[AlertResponsePydanticDataclass-True]" # AssertionError: assert 'AlertPydanticDataclass' in {'AlertResponsePydanticDataclass': ... }
+  ];
+
+  pythonImportsCheck = [ "sanic_ext" ];
+
+  meta = {
+    description = "Common, officially supported extension plugins for the Sanic web server framework";
+    homepage = "https://github.com/sanic-org/sanic-ext/";
+    changelog = "https://github.com/sanic-org/sanic-ext/releases/tag/${src.tag}";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ p0lyw0lf ];
+  };
+}
diff --git a/pkgs/development/python-modules/sanic/default.nix b/pkgs/development/python-modules/sanic/default.nix
index 01b697d154be..e83b467fa52a 100644
--- a/pkgs/development/python-modules/sanic/default.nix
+++ b/pkgs/development/python-modules/sanic/default.nix
@@ -13,6 +13,7 @@
   pytest-asyncio,
   pytestCheckHook,
   pythonOlder,
+  sanic-ext,
   sanic-routing,
   sanic-testing,
   setuptools,
@@ -54,9 +55,7 @@ buildPythonPackage rec {
   ];
 
   optional-dependencies = {
-    ext = [
-      # TODO: sanic-ext
-    ];
+    ext = [ sanic-ext ];
     http3 = [ aioquic ];
   };
 
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 1d8fcb86fbea..db966ff2b84e 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -15664,6 +15664,8 @@ self: super: with self; {
 
   sanic-auth = callPackage ../development/python-modules/sanic-auth { };
 
+  sanic-ext = callPackage ../development/python-modules/sanic-ext { };
+
   sanic-routing = callPackage ../development/python-modules/sanic-routing { };
 
   sanic-testing = callPackage ../development/python-modules/sanic-testing { };