diff --git a/pkgs/development/ocaml-modules/oseq/default.nix b/pkgs/development/ocaml-modules/oseq/default.nix
new file mode 100644
index 000000000000..cbe02de2ef11
--- /dev/null
+++ b/pkgs/development/ocaml-modules/oseq/default.nix
@@ -0,0 +1,33 @@
+{ lib, fetchFromGitHub, buildDunePackage
+, seq
+, containers, qcheck
+}:
+
+buildDunePackage rec {
+  version = "0.4";
+  pname = "oseq";
+
+  src = fetchFromGitHub {
+    owner = "c-cube";
+    repo = pname;
+    rev = "v${version}";
+    hash = "sha256-FoCBvvPwa/dUCrgDEd0clEKAO7EcpedjaO4v+yUO874=";
+  };
+
+  propagatedBuildInputs = [ seq ];
+
+  duneVersion = "3";
+
+  doCheck = true;
+  checkInputs = [
+    containers
+    qcheck
+  ];
+
+  meta = {
+    homepage = "https://c-cube.github.io/oseq/";
+    description = "Purely functional iterators compatible with standard `seq`";
+    license = lib.licenses.bsd2;
+    maintainers = [ lib.maintainers.vbgl ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 0f9762d8157b..acf2c564583f 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1116,6 +1116,8 @@ let
 
     ordering = callPackage ../development/ocaml-modules/ordering { };
 
+    oseq = callPackage ../development/ocaml-modules/oseq { };
+
     otfm = callPackage ../development/ocaml-modules/otfm { };
 
     otoml = callPackage ../development/ocaml-modules/otoml { };