diff --git a/pkgs/development/ocaml-modules/mdx/default.nix b/pkgs/development/ocaml-modules/mdx/default.nix
new file mode 100644
index 000000000000..29fee1b63184
--- /dev/null
+++ b/pkgs/development/ocaml-modules/mdx/default.nix
@@ -0,0 +1,28 @@
+{ stdenv, fetchFromGitHub, buildDunePackage, astring, cmdliner, cppo, fmt, logs, ocaml-migrate-parsetree, ocaml_lwt, pandoc, re }:
+
+buildDunePackage rec {
+  pname = "mdx";
+  version = "1.4.0";
+
+  minimumOCamlVersion = "4.05";
+
+  src = fetchFromGitHub {
+    owner = "realworldocaml";
+    repo = pname;
+    rev = version;
+    sha256 = "0ljd00d261s2wf7cab086asqi39icf9zs4nylni6dldaqb027d4w";
+  };
+
+  nativeBuildInputs = [ cppo ];
+  buildInputs = [ astring cmdliner fmt logs ocaml-migrate-parsetree re ];
+  checkInputs = [ ocaml_lwt pandoc ];
+
+  doCheck = true;
+
+  meta = {
+    homepage = https://github.com/realworldocaml/mdx;
+    description = "Executable OCaml code blocks inside markdown files";
+    license = stdenv.lib.licenses.isc;
+    maintainers = [ stdenv.lib.maintainers.romildo ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index c9acff143606..c01e2ce08bfd 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -428,6 +428,8 @@ let
 
     markup = callPackage ../development/ocaml-modules/markup { lwt = ocaml_lwt; };
 
+    mdx = callPackage ../development/ocaml-modules/mdx { };
+
     menhir = callPackage ../development/ocaml-modules/menhir { };
 
     merlin = callPackage ../development/tools/ocaml/merlin { };