diff --git a/pkgs/development/python-modules/tomli-w/default.nix b/pkgs/development/python-modules/tomli-w/default.nix
new file mode 100644
index 000000000000..bbd928ac16c7
--- /dev/null
+++ b/pkgs/development/python-modules/tomli-w/default.nix
@@ -0,0 +1,30 @@
+{ lib
+, buildPythonPackage
+, callPackage
+, fetchFromGitHub
+, flit-core
+}:
+
+buildPythonPackage rec {
+  pname = "tomli-w";
+  version = "1.0.0";
+  format = "pyproject";
+
+  src = fetchFromGitHub {
+    owner = "hukkin";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-wZSC5uOi1JUeKXIli1I8/Vo0wGsv9Q1I84dAMQQP95w=";
+  };
+
+  nativeBuildInputs = [ flit-core ];
+
+  pythonImportsCheck = [ "tomli_w" ];
+
+  meta = with lib; {
+    description = "A write-only counterpart to Tomli, which is a read-only TOML parser";
+    homepage = "https://github.com/hukkin/tomli-w";
+    license = licenses.mit;
+    maintainers = with maintainers; [ lovesegfault ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index f82a0e0851c9..02acc877b60c 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -9716,6 +9716,8 @@ in {
 
   tomli = callPackage ../development/python-modules/tomli { };
 
+  tomli-w = callPackage ../development/python-modules/tomli-w { };
+
   tomlkit = callPackage ../development/python-modules/tomlkit { };
 
   toolz = callPackage ../development/python-modules/toolz { };