diff --git a/pkgs/development/ocaml-modules/mlx/default.nix b/pkgs/development/ocaml-modules/mlx/default.nix
new file mode 100644
index 000000000000..436fc41ab5da
--- /dev/null
+++ b/pkgs/development/ocaml-modules/mlx/default.nix
@@ -0,0 +1,33 @@
+{
+  lib,
+  fetchFromGitHub,
+  buildDunePackage,
+  ppxlib,
+  menhir,
+}:
+
+buildDunePackage rec {
+  pname = "mlx";
+  version = "0.9";
+
+  minimalOCamlVersion = "4.14";
+
+  src = fetchFromGitHub {
+    owner = "ocaml-mlx";
+    repo = "mlx";
+    rev = version;
+    hash = "sha256-3hPtyBKD2dp4UJBykOudW6KR2KXPnBuDnuJ1UNLpAp0=";
+  };
+
+  buildInputs = [
+    ppxlib
+    menhir
+  ];
+
+  meta = with lib; {
+    description = "OCaml syntax dialect which adds JSX syntax expressions";
+    homepage = "https://github.com/ocaml-mlx/mlx";
+    license = licenses.lgpl21Plus;
+    maintainers = with maintainers; [ Denommus ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 618e94b92721..1eb7e48874fd 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1205,6 +1205,8 @@ let
 
     mlgmpidl =  callPackage ../development/ocaml-modules/mlgmpidl { };
 
+    mlx = callPackage ../development/ocaml-modules/mlx { };
+
     mm = callPackage ../development/ocaml-modules/mm { };
 
     mmap =  callPackage ../development/ocaml-modules/mmap { };