diff --git a/pkgs/development/ocaml-modules/multicore-magic/default.nix b/pkgs/development/ocaml-modules/multicore-magic/default.nix
new file mode 100644
index 000000000000..3082eece19cf
--- /dev/null
+++ b/pkgs/development/ocaml-modules/multicore-magic/default.nix
@@ -0,0 +1,24 @@
+{ lib, buildDunePackage, fetchurl
+, alcotest, domain_shims
+}:
+
+buildDunePackage rec {
+  pname = "multicore-magic";
+  version = "2.3.0";
+
+  src = fetchurl {
+    url = "https://github.com/ocaml-multicore/multicore-magic/releases/download/${version}/multicore-magic-${version}.tbz";
+    hash = "sha256-r50UqLOd2DoTz0CEXHpJMHX0fty+mGiAKTdtykgnzu4=";
+  };
+
+  doCheck = true;
+
+  checkInputs = [ alcotest domain_shims ];
+
+  meta = {
+    description = "Low-level multicore utilities for OCaml";
+    license = lib.licenses.isc;
+    homepage = "https://github.com/ocaml-multicore/multicore-magic";
+    maintainers = [ lib.maintainers.vbgl ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 8fb8986dd9b0..d550e02e42df 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1199,6 +1199,8 @@ let
 
     mtime =  callPackage ../development/ocaml-modules/mtime { };
 
+    multicore-magic =  callPackage ../development/ocaml-modules/multicore-magic { };
+
     multipart-form-data =  callPackage ../development/ocaml-modules/multipart-form-data { };
 
     mustache =  callPackage ../development/ocaml-modules/mustache { };