diff --git a/pkgs/development/python-modules/formatron/default.nix b/pkgs/development/python-modules/formatron/default.nix
new file mode 100644
index 000000000000..0353fc4d7b8b
--- /dev/null
+++ b/pkgs/development/python-modules/formatron/default.nix
@@ -0,0 +1,58 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  general-sam,
+  setuptools,
+  kbnf,
+  frozendict,
+  jsonschema,
+  pydantic,
+  transformers,
+  vllm,
+}:
+buildPythonPackage rec {
+  pname = "formatron";
+  version = "0.5.0";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "Dan-wanna-M";
+    repo = "formatron";
+    rev = "v${version}";
+    hash = "sha256-LQJza8F5wPcQO1y7Ino4slv7zoJMsZBn4LKLWYO9818=";
+    fetchSubmodules = true;
+  };
+
+  build-system = [
+    setuptools
+  ];
+
+  dependencies = [
+    frozendict
+    general-sam
+    jsonschema
+    kbnf
+    pydantic
+  ];
+
+  optional-dependencies = {
+    transformers = [
+      transformers
+    ];
+    vllm = [
+      vllm
+    ];
+  };
+
+  pythonImportsCheck = [
+    "formatron"
+  ];
+
+  meta = {
+    description = "Control the output format of language models";
+    homepage = "https://github.com/Dan-wanna-M/formatron";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ BatteredBunny ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 7dd1a1032a10..ae107ab0399e 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -5685,6 +5685,8 @@ self: super: with self; {
 
   forecast-solar = callPackage ../development/python-modules/forecast-solar { };
 
+  formatron = callPackage ../development/python-modules/formatron { };
+
   formbox = callPackage ../development/python-modules/formbox { };
 
   formencode = callPackage ../development/python-modules/formencode { };