diff --git a/pkgs/development/python-modules/tatsu/default.nix b/pkgs/development/python-modules/tatsu/default.nix
new file mode 100644
index 000000000000..539cbdca3ee1
--- /dev/null
+++ b/pkgs/development/python-modules/tatsu/default.nix
@@ -0,0 +1,40 @@
+{ stdenv, buildPythonPackage, fetchFromGitHub, pythonOlder
+, colorama, mypy, pyyaml, regex
+, dataclasses, typing
+, pytestrunner, pytest-mypy
+}:
+
+buildPythonPackage rec {
+  pname = "TatSu";
+  version = "4.4.0";
+
+  src = fetchFromGitHub {
+    owner = "neogeny";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "1jjd73yr3x56ij2ggxf6s62mf90i9v7wn3i0h67zxys55hlp2yh4";
+  };
+
+  nativeBuildInputs = [ pytestrunner ];
+  propagatedBuildInputs = [ colorama mypy pyyaml regex ]
+    ++ stdenv.lib.optionals (pythonOlder "3.7") [ dataclasses ]
+    ++ stdenv.lib.optionals (pythonOlder "3.5") [ typing ];
+  checkInputs = [ pytest-mypy ];
+
+  checkPhase = ''
+    pytest test/
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Generates Python parsers from grammars in a variation of EBNF";
+    longDescription = ''
+      TatSu (the successor to Grako) is a tool that takes grammars in a
+      variation of EBNF as input, and outputs memoizing (Packrat) PEG parsers in
+      Python.
+    '';
+    homepage = "https://tatsu.readthedocs.io/";
+    license = licenses.bsd2;
+    maintainers = with maintainers; [ primeos ];
+  };
+
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 82293c8a5714..11387381d02f 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -5054,6 +5054,8 @@ in {
 
   tasklib = callPackage ../development/python-modules/tasklib { };
 
+  tatsu = callPackage ../development/python-modules/tatsu { };
+
   tempita = callPackage ../development/python-modules/tempita { };
 
   terminado = callPackage ../development/python-modules/terminado { };