diff --git a/pkgs/development/ocaml-modules/oui/default.nix b/pkgs/development/ocaml-modules/oui/default.nix
new file mode 100644
index 000000000000..98c9d2e12c73
--- /dev/null
+++ b/pkgs/development/ocaml-modules/oui/default.nix
@@ -0,0 +1,60 @@
+{
+  lib,
+  buildDunePackage,
+  fetchFromGitHub,
+  cmdliner,
+  fmt,
+  markup,
+  ocaml-crunch,
+  opam-client,
+  opam-format,
+  ppx_deriving_yojson,
+  ppx_expect,
+  yojson,
+}:
+
+buildDunePackage (finalAttrs: {
+  pname = "oui";
+  version = "0-unstable-2025-10-08";
+
+  minimalOCamlVersion = "4.10";
+
+  src = fetchFromGitHub {
+    owner = "OCamlPro";
+    repo = "ocaml-universal-installer";
+    rev = "2fe2e33c3f8e1744fdd4dab04458043451bf9f62";
+    hash = "sha256-ALQIQ3Ab1Gs2xST9OwsO5IxixzgKlUg7uHZvfHMbv7Q=";
+  };
+
+  nativeBuildInputs = [
+    ocaml-crunch
+  ];
+
+  propagatedBuildInputs = [
+    cmdliner
+    fmt
+    markup
+    opam-client
+    opam-format
+    ppx_deriving_yojson
+    yojson
+  ];
+
+  # upstream tests are matching full library paths
+  doCheck = false;
+  checkInputs = [
+    ppx_expect
+  ];
+
+  meta = {
+    homepage = "https://github.com/OCamlPro/ocaml-universal-installer";
+    description = "A tool that builds standalone installers for your OCaml applications";
+    longDescription = ''
+      oui is a command-line tool that generates standalone installers for
+      Linux, Windows and macOS from your OCaml and non OCaml binaries.
+    '';
+    license = lib.licenses.lgpl21;
+    maintainers = [ lib.maintainers.stepbrobd ];
+    mainProgram = "opam-oui";
+  };
+})
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index ca85774f0051..fff4b9d90e2a 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1614,6 +1614,8 @@ let
 
         otr = callPackage ../development/ocaml-modules/otr { };
 
+        oui = callPackage ../development/ocaml-modules/oui { };
+
         ounit = callPackage ../development/ocaml-modules/ounit { };
 
         ounit2 = callPackage ../development/ocaml-modules/ounit2 { };