diff --git a/pkgs/development/ocaml-modules/repr/default.nix b/pkgs/development/ocaml-modules/repr/default.nix
new file mode 100644
index 000000000000..de6877ddd68e
--- /dev/null
+++ b/pkgs/development/ocaml-modules/repr/default.nix
@@ -0,0 +1,30 @@
+{ lib, buildDunePackage, fetchurl, fmt, uutf, jsonm, base64, either }:
+
+buildDunePackage rec {
+  pname = "repr";
+  version = "0.2.1";
+
+  minimumOCamlVersion = "4.08";
+
+  src = fetchurl {
+    url = "https://github.com/mirage/${pname}/releases/download/${version}/${pname}-fuzz-${version}.tbz";
+    sha256 = "1cbzbawbn71mmpw8y84s1p2pbhc055w1znz64jvr00c7fdr9p8hc";
+  };
+
+  useDune2 = true;
+
+  propagatedBuildInputs = [
+    fmt
+    uutf
+    jsonm
+    base64
+    either
+  ];
+
+  meta = with lib; {
+    description = "Dynamic type representations. Provides no stability guarantee";
+    homepage = "https://github.com/mirage/repr";
+    license = licenses.isc;
+    maintainers = [ maintainers.sternenseemann ];
+  };
+}
diff --git a/pkgs/development/ocaml-modules/repr/ppx.nix b/pkgs/development/ocaml-modules/repr/ppx.nix
new file mode 100644
index 000000000000..a1112ef9ac74
--- /dev/null
+++ b/pkgs/development/ocaml-modules/repr/ppx.nix
@@ -0,0 +1,23 @@
+{ buildDunePackage, repr, ppxlib, ppx_deriving, alcotest, hex }:
+
+buildDunePackage {
+  pname = "ppx_repr";
+
+  inherit (repr) src version useDune2;
+
+  propagatedBuildInputs = [
+    repr
+    ppxlib
+    ppx_deriving
+  ];
+
+  doCheck = true;
+  checkInputs = [
+    alcotest
+    hex
+  ];
+
+  meta = repr.meta // {
+    description = "PPX deriver for type representations";
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 22c1dba5ae2b..e1fd3ccc8fc4 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -885,6 +885,8 @@ let
 
     resource-pooling = callPackage ../development/ocaml-modules/resource-pooling { };
 
+    repr = callPackage ../development/ocaml-modules/repr { };
+
     result = callPackage ../development/ocaml-modules/ocaml-result { };
 
     secp256k1 = callPackage ../development/ocaml-modules/secp256k1 {
@@ -969,6 +971,8 @@ let
     ppx_irmin = callPackage ../development/ocaml-modules/irmin/ppx.nix {
     };
 
+    ppx_repr = callPackage ../development/ocaml-modules/repr/ppx.nix { };
+
     ppx_tools =
       if lib.versionAtLeast ocaml.version "4.02"
       then callPackage ../development/ocaml-modules/ppx_tools {}