diff --git a/pkgs/development/python-modules/lib50/default.nix b/pkgs/development/python-modules/lib50/default.nix
new file mode 100644
index 000000000000..4dedfc40b05b
--- /dev/null
+++ b/pkgs/development/python-modules/lib50/default.nix
@@ -0,0 +1,60 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchPypi,
+  setuptools,
+  attrs,
+  pexpect,
+  pyyaml,
+  requests,
+  termcolor,
+  jellyfish,
+  cryptography,
+  pytestCheckHook,
+}:
+
+buildPythonPackage rec {
+  pname = "lib50";
+  version = "3.0.12";
+  pyproject = true;
+
+  # latest GitHub release is several years old. Pypi is up to date.
+  src = fetchPypi {
+    pname = "lib50";
+    inherit version;
+    hash = "sha256-Fc4Hb1AbSeetK3gH1/dRCUfHGDlMzfzgF1cnK3Se01U=";
+  };
+
+  build-system = [ setuptools ];
+
+  dependencies = [
+    attrs
+    pexpect
+    pyyaml
+    requests
+    termcolor
+    jellyfish
+    cryptography
+  ];
+
+  pythonRelaxDeps = [
+    "attrs"
+    "pyyaml"
+    "termcolor"
+    "jellyfish"
+  ];
+
+  pythonImportsCheck = [ "lib50" ];
+
+  # latest GitHub release is several years old and doesn't include
+  # tests and neither does pypi version include tests
+  doCheck = false;
+
+  meta = {
+    description = "CS50's own internal library used in many of its tools";
+    homepage = "https://github.com/cs50/lib50";
+    license = lib.licenses.gpl3Only;
+    platforms = lib.platforms.unix;
+    maintainers = with lib.maintainers; [ ethancedwards8 ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 7517bfd26122..62d1ca5855c2 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -7791,6 +7791,8 @@ self: super: with self; {
 
   lib4vex = callPackage ../development/python-modules/lib4vex { };
 
+  lib50 = callPackage ../development/python-modules/lib50 { };
+
   libagent = callPackage ../development/python-modules/libagent { };
 
   libais = callPackage ../development/python-modules/libais { };