diff --git a/pkgs/development/ocaml-modules/base64/default.nix b/pkgs/development/ocaml-modules/base64/default.nix
new file mode 100644
index 000000000000..f7e4513d8265
--- /dev/null
+++ b/pkgs/development/ocaml-modules/base64/default.nix
@@ -0,0 +1,24 @@
+{ stdenv, fetchzip, ocaml, findlib }:
+
+let version = "2.0.0"; in
+
+stdenv.mkDerivation {
+  name = "ocaml-base64-${version}";
+
+  src = fetchzip {
+    url = "https://github.com/mirage/ocaml-base64/archive/v${version}.tar.gz";
+    sha256 = "1nv55gwq5vaxmrcz9ja2s165b1p9fhcxszc1l76043gpa56qm4fs";
+  };
+
+  buildInputs = [ ocaml findlib ];
+
+  createFindlibDestdir = true;
+
+  meta = {
+    homepage = https://github.com/mirage/ocaml-base64;
+    platforms = ocaml.meta.platforms;
+    description = "Base64 encoding and decoding in OCaml";
+    license = stdenv.lib.licenses.isc;
+    maintainers = with stdenv.lib.maintainers; [ vbgl ];
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index fba5857cfb4c..9fcacf55c043 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -3811,6 +3811,8 @@ let
 
     asn1-combinators = callPackage ../development/ocaml-modules/asn1-combinators { };
 
+    base64 = callPackage ../development/ocaml-modules/base64 { };
+
     bolt = callPackage ../development/ocaml-modules/bolt { };
 
     camlidl = callPackage ../development/tools/ocaml/camlidl { };