diff --git a/pkgs/by-name/zm/zmx/package.nix b/pkgs/by-name/zm/zmx/package.nix
new file mode 100644
index 000000000000..7648925b1527
--- /dev/null
+++ b/pkgs/by-name/zm/zmx/package.nix
@@ -0,0 +1,87 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  apple-sdk,
+  installShellFiles,
+  writeShellScriptBin,
+  zig_0_15,
+  nix-update-script,
+}:
+let
+  zig = zig_0_15;
+
+  sdkRoot = apple-sdk.sdkroot;
+  # Ghostty's Zig build asks Zig to discover the native Darwin SDK via
+  # std.zig.LibCInstallation.findNative, which shells out to xcrun/xcode-select
+  # on macOS. Provide wrappers so this works inside the Nix sandbox.
+  xcrunWrapper = writeShellScriptBin "xcrun" ''
+    echo "${sdkRoot}"
+  '';
+  xcodeselectWrapper = writeShellScriptBin "xcode-select" ''
+    echo "${sdkRoot}"
+  '';
+in
+stdenv.mkDerivation (finalAttrs: {
+  pname = "zmx";
+  version = "0.6.0";
+  __structuredAttrs = true;
+  strictDeps = true;
+
+  src = fetchFromGitHub {
+    owner = "neurosnap";
+    repo = "zmx";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-OkXtVf/LdBrZL6FH9TGx+mIhUXt2eSugLxZyMd+HL6k=";
+  };
+
+  zigDeps = zig.fetchDeps {
+    inherit (finalAttrs) src pname version;
+    fetchAll = true;
+    hash = "sha256-TwKoeaE4g5G7t7smKoqHkCCh998nSqKx5k6sO2vDlGs=";
+  };
+
+  postConfigure = ''
+    # Zig may write cache metadata next to fetched dependencies while checking them.
+    cp -rLT ${finalAttrs.zigDeps} "$ZIG_GLOBAL_CACHE_DIR/p"
+    chmod -R u+w "$ZIG_GLOBAL_CACHE_DIR/p"
+  '';
+
+  nativeBuildInputs = [
+    installShellFiles
+    zig
+  ]
+  ++ lib.optionals stdenv.hostPlatform.isDarwin [
+    xcrunWrapper
+    xcodeselectWrapper
+  ];
+
+  doCheck = true;
+
+  postInstall = lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
+    installShellCompletion --cmd ${finalAttrs.meta.mainProgram} \
+      --bash <($out/bin/zmx completions bash) \
+      --zsh <($out/bin/zmx completions zsh) \
+      --fish <($out/bin/zmx completions fish)
+  '';
+
+  passthru.updateScript = nix-update-script { };
+
+  meta = {
+    homepage = "https://github.com/neurosnap/zmx";
+    description = "Session persistence for terminal processes";
+    longDescription = ''
+      zmx provides session persistence for terminal shell sessions (pty processes).
+      Features include ability to attach and detach from shell sessions without killing them,
+      native terminal scrollback, multiple client connections to the same session,
+      and restoration of previous terminal state and output when re-attaching.
+    '';
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [
+      dwt
+      GabrielDougherty
+    ];
+    mainProgram = "zmx";
+    platforms = lib.platforms.unix;
+  };
+})