diff --git a/pkgs/development/ocaml-modules/encore/default.nix b/pkgs/development/ocaml-modules/encore/default.nix
new file mode 100644
index 00000000000..ab91117ac08
--- /dev/null
+++ b/pkgs/development/ocaml-modules/encore/default.nix
@@ -0,0 +1,20 @@
+{ lib, buildDunePackage, fetchurl, ocaml, alcotest, angstrom, ke }:
+
+buildDunePackage rec {
+  pname = "encore";
+  version = "0.3";
+  src = fetchurl {
+    url = "https://github.com/mirage/encore/releases/download/v${version}/encore-v${version}.tbz";
+    sha256 = "05nv6yms5axsmq9cspr7884rz5kirj50izx3vdm89q4yl186qykl";
+  };
+  propagatedBuildInputs = [ angstrom ke ];
+  checkInputs = lib.optional doCheck alcotest;
+  doCheck = lib.versions.majorMinor ocaml.version != "4.07";
+
+  meta = {
+    homepage = "https://github.com/mirage/encore";
+    description = "Library to generate encoder/decoder which ensure isomorphism";
+    license = lib.licenses.mit;
+    maintainers = [ lib.maintainers.vbgl ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 8b5d61b6149..10b4d03b70a 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -233,6 +233,8 @@ let
 
     elpi = callPackage ../development/ocaml-modules/elpi { };
 
+    encore = callPackage ../development/ocaml-modules/encore { };
+
     enumerate = callPackage ../development/ocaml-modules/enumerate { };
 
     eqaf = callPackage ../development/ocaml-modules/eqaf { };