diff --git a/pkgs/tools/misc/bonsai/default.nix b/pkgs/tools/misc/bonsai/default.nix
new file mode 100644
index 000000000000..1148eb6e98d3
--- /dev/null
+++ b/pkgs/tools/misc/bonsai/default.nix
@@ -0,0 +1,66 @@
+{ stdenv
+, lib
+, fetchFromSourcehut
+, gitUpdater
+, hare
+, hareThirdParty
+}:
+
+stdenv.mkDerivation rec {
+  pname = "bonsai";
+  version = "1.0.2";
+
+  src = fetchFromSourcehut {
+    owner = "~stacyharper";
+    repo = "bonsai";
+    rev = "v${version}";
+    hash = "sha256-Yosf07KUOQv4O5111tLGgI270g0KVGwzdTPtPOsTcP8=";
+  };
+
+  postPatch = ''
+    substituteInPlace Makefile \
+      --replace 'hare build' 'hare build $(HARE_TARGET_FLAGS)'
+  '';
+
+  nativeBuildInputs = [
+    hare
+  ];
+
+  buildInputs = with hareThirdParty; [
+    hare-ev
+    hare-json
+  ];
+
+  env.HARE_TARGET_FLAGS =
+    if stdenv.hostPlatform.isAarch64 then
+      "-a aarch64"
+    else if stdenv.hostPlatform.isRiscV64 then
+      "-a riscv64"
+    else if stdenv.hostPlatform.isx86_64 then
+      "-a x86_64"
+    else
+      "";
+  # TODO: hare setup-hook is supposed to do this for us.
+  # It does it correctly for native compilation, but not cross compilation: wrong offset?
+  env.HAREPATH = with hareThirdParty; "${hare-json}/src/hare/third-party:${hare-ev}/src/hare/third-party";
+
+  preConfigure = ''
+    export HARECACHE=$(mktemp -d)
+  '';
+
+  installFlags = [ "PREFIX=$(out)" ];
+
+  doCheck = true;
+
+  passthru.updateScript = gitUpdater {
+    rev-prefix = "v";
+  };
+
+  meta = with lib; {
+    description = "Finite State Machine structured as a tree";
+    homepage = "https://git.sr.ht/~stacyharper/bonsai";
+    license = licenses.agpl3;
+    maintainers = with maintainers; [ colinsane ];
+    platforms = platforms.linux;
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 5d156a6715ea..24b3d1b27dd2 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1757,6 +1757,8 @@ with pkgs;
 
   bikeshed = python3Packages.callPackage ../applications/misc/bikeshed { };
 
+  bonsai = callPackage ../tools/misc/bonsai { };
+
   cie-middleware-linux = callPackage ../tools/security/cie-middleware-linux { };
 
   cidrgrep = callPackage ../tools/text/cidrgrep { };