diff --git a/flake.lock b/flake.lock
index 4e4f632..9fabdc6 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,5 +1,22 @@
 {
   "nodes": {
+    "brew-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1778427648,
+        "narHash": "sha256-pt9KaDGsMyYWB9JeHs4XGHs870f1lOZe3vx9LpVIhUE=",
+        "owner": "Homebrew",
+        "repo": "brew",
+        "rev": "6f293daa9f9f5832e13b497976335e90509886d7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Homebrew",
+        "ref": "5.1.11",
+        "repo": "brew",
+        "type": "github"
+      }
+    },
     "flake-compat": {
       "locked": {
         "lastModified": 1761640442,
@@ -72,6 +89,45 @@
         "type": "github"
       }
     },
+    "nix-darwin": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1779036909,
+        "narHash": "sha256-zXcwYQGCT6pzinK+1dBB2ekTVtfxGZAapb3Evdcu4fY=",
+        "owner": "nix-darwin",
+        "repo": "nix-darwin",
+        "rev": "56c666e108467d87d13508936aade6d567f2a501",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-darwin",
+        "ref": "nix-darwin-26.05",
+        "repo": "nix-darwin",
+        "type": "github"
+      }
+    },
+    "nix-homebrew": {
+      "inputs": {
+        "brew-src": "brew-src"
+      },
+      "locked": {
+        "lastModified": 1778851564,
+        "narHash": "sha256-p8wzcnpB2Iys+QzAKM9/Eyw/pUyqCO3sw/NCnDH4dTE=",
+        "owner": "zhaofengli",
+        "repo": "nix-homebrew",
+        "rev": "b3a87b4793205cc111f3c61e25e018ffac3b8039",
+        "type": "github"
+      },
+      "original": {
+        "owner": "zhaofengli",
+        "repo": "nix-homebrew",
+        "type": "github"
+      }
+    },
     "nixos-apple-silicon": {
       "inputs": {
         "flake-compat": "flake-compat",
@@ -149,6 +205,8 @@
       "inputs": {
         "flake-parts": "flake-parts",
         "home-manager": "home-manager",
+        "nix-darwin": "nix-darwin",
+        "nix-homebrew": "nix-homebrew",
         "nixos-apple-silicon": "nixos-apple-silicon",
         "nixos-wsl": "nixos-wsl",
         "nixpkgs": "nixpkgs",
diff --git a/flake.nix b/flake.nix
index 777636c..2378dfb 100644
--- a/flake.nix
+++ b/flake.nix
@@ -15,6 +15,11 @@
     # Apple Silicon (Asahi) support for the MacBook host.
     nixos-apple-silicon.url = "github:nix-community/nixos-apple-silicon";
     nixos-apple-silicon.inputs.nixpkgs.follows = "nixpkgs";
+    # nix-darwin: manage macOS hosts from this same flake.
+    nix-darwin.url = "github:nix-darwin/nix-darwin/nix-darwin-26.05";
+    nix-darwin.inputs.nixpkgs.follows = "nixpkgs";
+    # nix-homebrew: declaratively own and install the Homebrew prefix on macOS.
+    nix-homebrew.url = "github:zhaofengli/nix-homebrew";
     # Provides mkFlake: the systems/perSystem scaffolding used below.
     flake-parts.url = "github:hercules-ci/flake-parts";
     flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";
@@ -28,6 +33,8 @@
       home-manager,
       nixos-wsl,
       nixos-apple-silicon,
+      nix-darwin,
+      nix-homebrew,
       ...
     }:
     flake-parts.lib.mkFlake { inherit inputs; } (
@@ -51,20 +58,23 @@
           "lens-desktop"
         ];
 
-        # Shared scaffolding for every host: common user, overlays, home-manager.
+        # nixpkgs + nix-daemon settings shared by NixOS and Darwin hosts.
+        commonModule = {
+          nixpkgs.overlays = overlays;
+          nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) unfreePackages;
+          nix.settings.experimental-features = [
+            "nix-command"
+            "flakes"
+          ];
+          # Make `nix shell nixpkgs#...` and <nixpkgs> use the pinned nixpkgs.
+          nix.registry.nixpkgs.flake = nixpkgs;
+          nix.nixPath = [ "nixpkgs=${nixpkgs}" ];
+        };
+
+        # Shared scaffolding for every NixOS host: common user, settings, home-manager.
         baseModules = [
           ./lyrathorpe/user.nix
-          {
-            nixpkgs.overlays = overlays;
-            nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) unfreePackages;
-            nix.settings.experimental-features = [
-              "nix-command"
-              "flakes"
-            ];
-            # Make `nix shell nixpkgs#...` and <nixpkgs> use the pinned nixpkgs.
-            nix.registry.nixpkgs.flake = nixpkgs;
-            nix.nixPath = [ "nixpkgs=${nixpkgs}" ];
-          }
+          commonModule
           home-manager.nixosModules.home-manager
           {
             home-manager.useGlobalPkgs = true;
@@ -99,6 +109,44 @@
               ];
           };
 
+        # Shared scaffolding for every Darwin (macOS) host.
+        darwinBaseModules = [
+          commonModule
+          nix-homebrew.darwinModules.nix-homebrew
+          home-manager.darwinModules.home-manager
+          {
+            home-manager.useGlobalPkgs = true;
+            home-manager.useUserPackages = true;
+          }
+        ];
+
+        # mkDarwinHost :: { system, username, fullName, modules, homeModules } -> darwinSystem
+        # Darwin counterpart of mkHost. macOS already owns the login user, so we
+        # only attach the platform and home-manager; no NixOS user module here.
+        mkDarwinHost =
+          {
+            system,
+            username,
+            fullName,
+            modules,
+            homeModules,
+          }:
+          nix-darwin.lib.darwinSystem {
+            specialArgs = { inherit inputs username fullName; };
+            modules =
+              darwinBaseModules
+              ++ modules
+              ++ [
+                {
+                  nixpkgs.hostPlatform = system;
+                  # macOS owns the account; point home-manager at its home dir.
+                  users.users.${username}.home = "/Users/${username}";
+                  home-manager.extraSpecialArgs = { inherit inputs username fullName; };
+                  home-manager.users.${username}.imports = homeModules;
+                }
+              ];
+          };
+
         # Host table — declarative registry of every machine. To add a host:
         # give it a name, its `system`, the owning user, and the module lists.
         # mapAttrs below turns each entry into a nixosConfiguration of the same name.
@@ -147,11 +195,30 @@
             ];
           };
         };
+
+        # Darwin host table — macOS machines built via mkDarwinHost. The shared
+        # ./lyrathorpe/home modules (shell, git, editor) are reused; the Linux-only
+        # desktop/sway modules are intentionally left out.
+        darwinHosts = {
+          lyrathorpe-mac = {
+            system = "aarch64-darwin";
+            username = "lyrathorpe";
+            fullName = "Lyra Thorpe";
+            modules = [
+              ./system/machine/Darwin/configuration.nix
+            ];
+            homeModules = [
+              ./lyrathorpe/home
+            ];
+          };
+        };
       in
       {
         systems = [
           "x86_64-linux"
           "aarch64-linux"
+          "aarch64-darwin"
+          "x86_64-darwin"
         ];
 
         # perSystem is evaluated once per entry in `systems`; `pkgs` is the
@@ -180,8 +247,9 @@
                 '';
           };
 
-        # Realise the host table: each `hosts` entry becomes a nixosConfiguration.
+        # Realise the host tables: each entry becomes a {nixos,darwin}Configuration.
         flake.nixosConfigurations = lib.mapAttrs (_name: mkHost) hosts;
+        flake.darwinConfigurations = lib.mapAttrs (_name: mkDarwinHost) darwinHosts;
       }
     );
 }
diff --git a/system/machine/Darwin/configuration.nix b/system/machine/Darwin/configuration.nix
new file mode 100644
index 0000000..755de91
--- /dev/null
+++ b/system/machine/Darwin/configuration.nix
@@ -0,0 +1,137 @@
+# Default nix-darwin host. Minimal macOS baseline; the user environment
+# (shell, git, editor) is carried by the shared ./lyrathorpe/home modules,
+# the same ones used by the Linux hosts. nixpkgs.hostPlatform is set by
+# mkDarwinHost in flake.nix.
+{ pkgs, username, ... }:
+{
+  programs.zsh.enable = true;
+
+  # CLI tooling sourced from nixpkgs instead of Homebrew formulae. Pure library
+  # dependencies are omitted; nix pulls them into closures automatically.
+  environment.systemPackages = with pkgs; [
+    # Build & toolchain
+    autoconf
+    automake
+    cmake
+    coreutils
+    gcc
+    gettext
+    gnumake
+    pkgconf
+    ruby
+    zig
+    # Version control & dev workflow
+    pre-commit
+    deno
+    opentofu
+    # Compression
+    lz4
+    p7zip
+    xz
+    zstd
+    # Crypto & networking
+    gnupg
+    gnutls
+    openssl
+    pinentry_mac
+    unbound
+    wget
+    # Media
+    ffmpeg
+    svt-av1
+    yt-dlp
+    # Graphics / Vulkan / SDL
+    glslang
+    moltenvk
+    spirv-tools
+    vulkan-loader
+    vulkan-tools
+    SDL2
+    sdl3
+    # Embedded
+    esptool
+    picotool
+    # Misc utilities
+    f3
+    gnused
+    lua5_4
+    magic-wormhole
+    ncurses
+    sqlite
+  ];
+
+  # Account that runs user-level activation and Homebrew.
+  system.primaryUser = username;
+
+  # nix-homebrew owns and installs the Homebrew prefix declaratively, so brew
+  # itself no longer needs a manual bootstrap. enableRosetta permits x86_64
+  # formulae via Rosetta 2 on Apple Silicon.
+  nix-homebrew = {
+    enable = true;
+    enableRosetta = true;
+    user = username;
+  };
+
+  # Declarative Homebrew for packages with no nixpkgs equivalent or that must be
+  # the vendor build (GUI casks, Mac App Store apps).
+  homebrew = {
+    enable = true;
+    onActivation = {
+      autoUpdate = true;
+      upgrade = true;
+      # Lists below are authoritative: anything not declared is uninstalled.
+      cleanup = "zap";
+    };
+    taps = [ ];
+    # Formulae kept on brew: vendor PWA host and version-pinned toolchains that
+    # are simpler to track via brew than to match exactly in nixpkgs.
+    brews = [
+      "firefoxpwa"
+      "llvm@21"
+      "lld@21"
+      "python@3.14"
+    ];
+    # GUI applications. macOS app bundles are managed as casks; nixpkgs darwin
+    # GUI support is unreliable, so these stay on brew for continuity.
+    casks = [
+      "alfred"
+      "android-platform-tools"
+      "angry-ip-scanner"
+      "arduino-ide"
+      "autodesk-fusion"
+      "bambu-studio"
+      "bitwarden"
+      "citrix-workspace"
+      "curseforge"
+      "discord"
+      "firefox"
+      "freecad"
+      "gcc-arm-embedded"
+      "google-chrome"
+      "istat-menus"
+      "iterm2"
+      "macfuse"
+      "microsoft-teams"
+      "nextcloud"
+      "obs"
+      "omnidisksweeper"
+      "openscad@snapshot"
+      "orcaslicer"
+      "plex"
+      "plexamp"
+      "postman"
+      "signal"
+      "steam"
+      "thunderbird"
+      "virtualbox"
+      "visual-studio-code"
+      "vnc-viewer"
+      "vscodium"
+      "winbox"
+    ];
+    masApps = { };
+  };
+
+  # Used for backwards compatibility; read `darwin-rebuild changelog` before changing.
+  system.stateVersion = 5;
+}