diff --git a/pkgs/development/ocaml-modules/sail/default.nix b/pkgs/development/ocaml-modules/sail/default.nix
new file mode 100644
index 00000000000..f66abd2bdcf
--- /dev/null
+++ b/pkgs/development/ocaml-modules/sail/default.nix
@@ -0,0 +1,79 @@
+{ lib
+, fetchFromGitHub
+, buildDunePackage
+, base64
+, omd
+, menhir
+, ott
+, linenoise
+, dune-site
+, pprint
+, makeWrapper
+, lem
+, z3
+, linksem
+, num
+}:
+
+buildDunePackage rec {
+  pname = "sail";
+  version = "0.15";
+
+  src = fetchFromGitHub {
+    owner = "rems-project";
+    repo = "sail";
+    rev = version;
+    hash = "sha256-eNdFOSzkniNvSCZeORRJ/IYAu+9P4HSouwmhd4BQLPk=";
+  };
+
+  duneVersion = "3";
+  minimalOCamlVersion = "4.08";
+
+  nativeBuildInputs = [
+    makeWrapper
+    ott
+    menhir
+    lem
+  ];
+
+  propagatedBuildInputs = [
+    base64
+    omd
+    dune-site
+    linenoise
+    pprint
+    linksem
+  ];
+
+  preBuild = ''
+    rm -r aarch*  # Remove code derived from non-bsd2 arm spec
+    rm -r snapshots  # Some of this might be derived from stuff in the aarch dir, it builds fine without it
+  '';
+  # `buildDunePackage` only builds the [pname] package
+  # This doesnt work in this case, as sail includes multiple packages in the same source tree
+  buildPhase = ''
+    runHook preBuild
+    dune build --release ''${enableParallelBuild:+-j $NIX_BUILD_CORES}
+    runHook postBuild
+  '';
+  checkPhase = ''
+    runHook preCheck
+    dune runtest ''${enableParallelBuild:+-j $NIX_BUILD_CORES}
+    runHook postCheck
+  '';
+  installPhase = ''
+    runHook preInstall
+    dune install --prefix $out --libdir $OCAMLFIND_DESTDIR
+    runHook postInstall
+  '';
+  postInstall = ''
+    wrapProgram $out/bin/sail --set SAIL_DIR $out/share/sail
+  '';
+
+  meta = with lib; {
+    homepage = "https://github.com/rems-project/sail";
+    description = "A language for describing the instruction-set architecture (ISA) semantics of processors";
+    maintainers = with maintainers; [ genericnerdyusername ];
+    license = licenses.bsd2;
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 145203e837b..0e704ce26af 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1244,6 +1244,8 @@ let
 
     rusage = callPackage ../development/ocaml-modules/rusage { };
 
+    sail = callPackage ../development/ocaml-modules/sail { };
+
     samplerate = callPackage ../development/ocaml-modules/samplerate { };
 
     secp256k1 = callPackage ../development/ocaml-modules/secp256k1 {