diff --git a/pkgs/development/ocaml-modules/mldoc/default.nix b/pkgs/development/ocaml-modules/mldoc/default.nix
new file mode 100644
index 00000000000..2d184e68a0e
--- /dev/null
+++ b/pkgs/development/ocaml-modules/mldoc/default.nix
@@ -0,0 +1,65 @@
+{ lib
+, buildDunePackage
+, fetchFromGitHub
+, fetchpatch
+, angstrom
+, cmdliner
+, core
+, core_bench
+, js_of_ocaml
+, js_of_ocaml-ppx
+, ppx_deriving_yojson
+, uri
+, yojson
+, lwt
+, xmlm
+}:
+let
+  angstrom' = angstrom.overrideAttrs (attrs: {
+    patches = attrs.patches or [ ] ++ [
+      # mldoc requires Angstrom to expose `unsafe_lookahead`
+      (fetchpatch {
+        url = "https://github.com/logseq/angstrom/commit/bbe36c99c13678937d4c983a427e02a733d6cc24.patch";
+        sha256 = "sha256-RapY1QJ8U0HOqJ9TFDnCYB4tFLFuThESzdBZqjYuDUA=";
+      })
+    ];
+  });
+  uri' = uri.override { angstrom = angstrom'; };
+in
+buildDunePackage rec {
+  pname = "mldoc";
+  version = "1.3.9";
+
+  minimalOCamlVersion = "4.10";
+
+  src = fetchFromGitHub {
+    owner = "logseq";
+    repo = "mldoc";
+    rev = "v${version}";
+    sha256 = "sha256-C5SeG10EoZixCWeBxw7U+isAR8UWd1jzHLdmbp//gAs=";
+  };
+
+  buildInputs = [
+    cmdliner
+    core
+    core_bench
+    js_of_ocaml
+    js_of_ocaml-ppx
+    lwt
+  ];
+
+  propagatedBuildInputs = [
+    angstrom'
+    uri'
+    yojson
+    ppx_deriving_yojson
+    xmlm
+  ];
+
+  meta = with lib; {
+    homepage = "https://github.com/logseq/mldoc";
+    description = "Another Emacs Org-mode and Markdown parser";
+    license = licenses.agpl3Only;
+    maintainers = with maintainers; [ marsam ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 5083f1733cd..efebf7e3853 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -899,6 +899,8 @@ let
 
     mirage-vnetif = callPackage ../development/ocaml-modules/mirage-vnetif { };
 
+    mldoc =  callPackage ../development/ocaml-modules/mldoc { };
+
     mlgmp =  callPackage ../development/ocaml-modules/mlgmp { };
 
     mlgmpidl =  callPackage ../development/ocaml-modules/mlgmpidl { };