diff --git a/pkgs/development/ocaml-modules/wodan/default.nix b/pkgs/development/ocaml-modules/wodan/default.nix
new file mode 100644
index 000000000000..64ca29f20308
--- /dev/null
+++ b/pkgs/development/ocaml-modules/wodan/default.nix
@@ -0,0 +1,40 @@
+{ lib, buildDunePackage, fetchFromGitHub, lwt_ppx, ppx_cstruct, optint
+, checkseum, diet, bitv, nocrypto, logs, lru, io-page, mirage-block }:
+
+buildDunePackage rec {
+  pname = "wodan";
+  version = "unstable-2020-11-20";
+
+  useDune2 = true;
+
+  src = fetchFromGitHub {
+    owner = "mirage";
+    repo = pname;
+    rev = "cc08fe25888051c207f1009bcd2d39f8c514484f";
+    sha256 = "0186vlhnl8wcz2hmpn327n9a0bibnypmjy3w4nxq3yyglh6vj1im";
+    fetchSubmodules = true;
+  };
+
+  minimumOCamlVersion = "4.08";
+
+  propagatedBuildInputs = [
+    lwt_ppx
+    ppx_cstruct
+    optint
+    checkseum
+    diet
+    bitv
+    nocrypto
+    logs
+    lru
+    io-page
+    mirage-block
+  ];
+
+  meta = with lib; {
+    inherit (src.meta) homepage;
+    description = "A flash-friendly, safe and flexible filesystem library";
+    license = licenses.isc;
+    maintainers = with maintainers; [ ehmry ];
+  };
+}
diff --git a/pkgs/development/ocaml-modules/wodan/irmin.nix b/pkgs/development/ocaml-modules/wodan/irmin.nix
new file mode 100644
index 000000000000..a42259af9e6b
--- /dev/null
+++ b/pkgs/development/ocaml-modules/wodan/irmin.nix
@@ -0,0 +1,20 @@
+{ lib, buildDunePackage, io-page-unix, irmin-chunk, irmin-git, irmin-unix
+, mirage-block-ramdisk, mirage-block-unix, wodan }:
+
+buildDunePackage rec {
+  pname = "wodan-irmin";
+  inherit (wodan) version src useDune2;
+
+  propagatedBuildInputs = [
+    io-page-unix
+    irmin-chunk
+    irmin-git
+    irmin-unix
+    mirage-block-ramdisk
+    mirage-block-unix
+    wodan
+  ];
+
+  meta = wodan.meta // { description = "Wodan as an Irmin store"; };
+
+}
diff --git a/pkgs/development/ocaml-modules/wodan/unix.nix b/pkgs/development/ocaml-modules/wodan/unix.nix
new file mode 100644
index 000000000000..64a18b6b83d7
--- /dev/null
+++ b/pkgs/development/ocaml-modules/wodan/unix.nix
@@ -0,0 +1,27 @@
+{ lib, buildDunePackage, base64, benchmark, csv, cmdliner, wodan, afl-persistent
+, io-page-unix, mirage-block-ramdisk, mirage-block-unix }:
+
+buildDunePackage rec {
+  outputs = [ "bin" "out" ];
+  pname = "wodan-unix";
+  inherit (wodan) version src useDune2;
+
+  propagatedBuildInputs = [
+    afl-persistent
+    base64
+    benchmark
+    cmdliner
+    csv
+    io-page-unix
+    mirage-block-ramdisk
+    mirage-block-unix
+    wodan
+  ];
+
+  postInstall = ''
+    moveToOutput bin "''${!outputBin}"
+  '';
+
+  meta = wodan.meta // { description = "Wodan clients with Unix integration"; };
+
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 97650eca2c6e..78b5959f3c2b 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1075,6 +1075,12 @@ let
 
     webmachine = callPackage ../development/ocaml-modules/webmachine { };
 
+    wodan = callPackage ../development/ocaml-modules/wodan { };
+
+    wodan-irmin = callPackage ../development/ocaml-modules/wodan/irmin.nix { };
+
+    wodan-unix = callPackage ../development/ocaml-modules/wodan/unix.nix { };
+
     wtf8 = callPackage ../development/ocaml-modules/wtf8 { };
 
     x509 = callPackage ../development/ocaml-modules/x509 { };