diff --git a/pkgs/tools/misc/blacken-docs/default.nix b/pkgs/tools/misc/blacken-docs/default.nix
new file mode 100644
index 00000000000..186f1d393ac
--- /dev/null
+++ b/pkgs/tools/misc/blacken-docs/default.nix
@@ -0,0 +1,38 @@
+{ black
+, fetchFromGitHub
+, lib
+, python3
+}:
+python3.pkgs.buildPythonApplication rec {
+  pname = "blacken-docs";
+  version = "1.15.0";
+  format = "pyproject";
+
+  src = fetchFromGitHub {
+    owner = "adamchainz";
+    repo = "blacken-docs";
+    rev = version;
+    hash = "sha256-3FGuFOAHCcybPwujWlh58NWtuF5CebaKTgBWgCGpSL8=";
+  };
+
+  nativeBuildInputs = [
+    python3.pkgs.setuptools
+  ];
+
+  propagatedBuildInputs = [
+    black
+  ];
+
+  nativeCheckInputs = [
+    black
+    python3.pkgs.pytestCheckHook
+  ];
+
+  meta = with lib; {
+    homepage = "https://github.com/adamchainz/blacken-docs";
+    changelog = "https://github.com/adamchainz/blacken-docs/blob/${src.rev}/CHANGELOG.rst";
+    description = "Run Black on Python code blocks in documentation files";
+    license = licenses.mit;
+    maintainers = with maintainers; [ l0b0 ];
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 538f4623d7a..9be5921c2dc 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6916,6 +6916,8 @@ with pkgs;
 
   bbin = callPackage ../development/tools/bbin { };
 
+  blacken-docs = callPackage ../tools/misc/blacken-docs { };
+
   bore = callPackage ../tools/networking/bore {
     inherit (darwin) Libsystem;
     inherit (darwin.apple_sdk.frameworks) SystemConfiguration;