diff --git a/pkgs/development/ocaml-modules/callipyge/default.nix b/pkgs/development/ocaml-modules/callipyge/default.nix
new file mode 100644
index 00000000000..a9dfb80f2a1
--- /dev/null
+++ b/pkgs/development/ocaml-modules/callipyge/default.nix
@@ -0,0 +1,36 @@
+{ lib
+, buildDunePackage
+, fetchurl
+, ocaml
+
+, alcotest
+, eqaf
+, fmt
+}:
+
+buildDunePackage rec {
+  pname = "callipyge";
+  version = "0.2";
+
+  src = fetchurl {
+    url = "https://github.com/oklm-wsh/Callipyge/releases/download/v${version}/${pname}-${version}.tbz";
+    sha256 = "sha256-T/94a88xvK51TggjXecdKc9kyTE9aIyueIt5T24sZB0=";
+  };
+
+  useDune2 = true;
+
+  minimumOCamlVersion = "4.03";
+
+  propagatedBuildInputs = [ fmt eqaf ];
+
+  # alcotest isn't available for OCaml < 4.05 due to fmt
+  doCheck = lib.versionAtLeast ocaml.version "4.05";
+  checkInputs = [ alcotest ];
+
+  meta = {
+    homepage = "https://github.com/oklm-wsh/Callipyge";
+    description = "Curve25519 in OCaml";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ fufexan ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 5ed0b29b4d5..eea58f57408 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -141,6 +141,8 @@ let
 
     cairo2 = callPackage ../development/ocaml-modules/cairo2 { };
 
+    callipyge = callPackage ../development/ocaml-modules/callipyge { };
+
     caqti = callPackage ../development/ocaml-modules/caqti { };
 
     caqti-async = callPackage ../development/ocaml-modules/caqti/async.nix { };