diff --git a/pkgs/development/ocaml-modules/curly/default.nix b/pkgs/development/ocaml-modules/curly/default.nix
new file mode 100644
index 000000000000..1d455582b3b3
--- /dev/null
+++ b/pkgs/development/ocaml-modules/curly/default.nix
@@ -0,0 +1,27 @@
+{ lib, buildDunePackage, fetchFromGitHub, ocaml
+, result, alcotest, cohttp-lwt-unix, odoc, curl }:
+
+buildDunePackage rec {
+  pname = "curly";
+  version = "unstable-2019-11-14";
+
+  minimumOCamlVersion = "4.02";
+
+  src = fetchFromGitHub {
+    owner  = "rgrinberg";
+    repo   = pname;
+    rev    = "33a538c89ef8279d4591454a7f699a4183dde5d0";
+    sha256 = "10pxbvf5xrsajaxrccxh2lqhgp3yaf61z9w03rvb2mq44nc2dggz";
+  };
+
+  propagatedBuildInputs = [ result ];
+  checkInputs = [ alcotest cohttp-lwt-unix ];
+  # test dependencies are only available for >= 4.05
+  doCheck = lib.versionAtLeast ocaml.version "4.05";
+
+  postPatch = ''
+    substituteInPlace src/curly.ml \
+      --replace "exe=\"curl\"" "exe=\"${curl}/bin/curl\""
+    '';
+}
+
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 74baab7d0d5a..010e46bf5490 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -187,6 +187,10 @@ let
 
     csv-lwt = callPackage ../development/ocaml-modules/csv/lwt.nix { };
 
+    curly = callPackage ../development/ocaml-modules/curly {
+      inherit (pkgs) curl;
+    };
+
     curses = callPackage ../development/ocaml-modules/curses { };
 
     custom_printf = callPackage ../development/ocaml-modules/custom_printf { };