diff --git a/pkgs/development/ocaml-modules/variantslib/default.nix b/pkgs/development/ocaml-modules/variantslib/default.nix
new file mode 100644
index 00000000000..cb25b844606
--- /dev/null
+++ b/pkgs/development/ocaml-modules/variantslib/default.nix
@@ -0,0 +1,22 @@
+{stdenv, buildOcaml, fetchurl, type_conv}:
+
+buildOcaml rec {
+  name = "variantslib";
+  version = "109.15.03";
+
+  minimumSupportedOcamlVersion = "4.00";
+
+  src = fetchurl {
+    url = "https://github.com/janestreet/variantslib/archive/${version}.tar.gz";
+    sha256 = "a948dcdd4ca54786fe0646386b6e37a9db03bf276c6557ea374d82740bf18055";
+  };
+
+  propagatedBuildInputs = [ type_conv ];
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/janestreet/variantslib;
+    description = "OCaml variants as first class values";
+    license = licenses.asl20;
+    maintainers = [ maintainers.ericbmerritt ];
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 6f3b1781d78..4318cd8f13e 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -4370,6 +4370,8 @@ let
     uuseg = callPackage ../development/ocaml-modules/uuseg { };
     uutf = callPackage ../development/ocaml-modules/uutf { };
 
+    variantslib = callPackage ../development/ocaml-modules/variantslib { };
+
     vg = callPackage ../development/ocaml-modules/vg { };
 
     xmlm = callPackage ../development/ocaml-modules/xmlm { };