diff --git a/pkgs/development/ocaml-modules/tar/default.nix b/pkgs/development/ocaml-modules/tar/default.nix
new file mode 100644
index 000000000000..abc28e2d879f
--- /dev/null
+++ b/pkgs/development/ocaml-modules/tar/default.nix
@@ -0,0 +1,39 @@
+{ lib
+, fetchFromGitHub
+, buildDunePackage
+, ppx_cstruct
+, cstruct
+, re
+, ppx_tools
+}:
+
+buildDunePackage rec {
+  pname = "tar";
+  version = "1.1.0";
+  src = fetchFromGitHub {
+    owner = "mirage";
+    repo = "ocaml-tar";
+    rev = "v${version}";
+    sha256 = "14k24vn3q5jl0iyrynb5vwg80670qsv12fsmc6cdgh4zwdpjh7zs";
+  };
+
+  useDune2 = true;
+
+  propagatedBuildInputs = [
+    ppx_cstruct
+    cstruct
+    re
+  ];
+
+  buildInputs = [
+    ppx_tools
+  ];
+
+  doCheck = true;
+
+  meta = {
+    description = "Decode and encode tar format files from Unix";
+    license = lib.licenses.mit;
+    maintainers = [ lib.maintainers.ulrikstrid ];
+  };
+}
diff --git a/pkgs/development/ocaml-modules/tar/unix.nix b/pkgs/development/ocaml-modules/tar/unix.nix
new file mode 100644
index 000000000000..4ac1f625a02a
--- /dev/null
+++ b/pkgs/development/ocaml-modules/tar/unix.nix
@@ -0,0 +1,27 @@
+{ lib
+, buildDunePackage
+, tar
+, cstruct
+, cstruct-lwt
+, re
+, lwt
+}:
+
+buildDunePackage rec {
+  pname = "tar-unix";
+  inherit (tar) version src useDune2 doCheck;
+
+  propagatedBuildInputs = [
+    tar
+    cstruct
+    cstruct-lwt
+    re
+    lwt
+  ];
+
+  meta = {
+    description = "Decode and encode tar format files from Unix";
+    license = lib.licenses.mit;
+    maintainers = [ lib.maintainers.ulrikstrid ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 44de4ed9aeaf..9b5c24f6b70e 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1074,6 +1074,10 @@ let
 
     spacetime_lib = callPackage ../development/ocaml-modules/spacetime_lib { };
 
+    tar-unix = callPackage ../development/ocaml-modules/tar/unix.nix { };
+
+    tar = callPackage ../development/ocaml-modules/tar { };
+
     tcpip = callPackage ../development/ocaml-modules/tcpip { };
 
     tsort = callPackage ../development/ocaml-modules/tsort { };