diff --git a/glados_gui.py b/glados_gui.py
index c183f4f..add7285 100644
--- a/glados_gui.py
+++ b/glados_gui.py
@@ -95,11 +95,44 @@ def list_ollama_models() -> List[str]:
         except Exception:
             return []
 
+# --- App icon helpers (Tk + macOS Dock) ---
+def _set_app_icon(root: tk.Tk, png_path: pathlib.Path):
+    """
+    Sets the window icon (cross-platform) and, on macOS, the Dock icon.
+    Falls back gracefully if assets or modules are missing.
+    """
+    # 1) Tk window/taskbar icon
+    try:
+        if png_path.exists():
+            try:
+                if PIL_OK:
+                    _img = Image.open(str(png_path))
+                    root._app_icon = ImageTk.PhotoImage(_img)  # keep ref!
+                else:
+                    root._app_icon = tk.PhotoImage(file=str(png_path))  # keep ref!
+                root.iconphoto(True, root._app_icon)
+            except Exception:
+                pass
+    except Exception:
+        pass
+
+    # 2) macOS Dock icon via PyObjC (optional)
+    if sys.platform == "darwin":
+        try:
+            from Cocoa import NSImage, NSApplication  # type: ignore
+            app = NSApplication.sharedApplication()
+            nsimg = NSImage.alloc().initWithContentsOfFile_(str(png_path))
+            if nsimg is not None:
+                app.setApplicationIconImage_(nsimg)
+        except Exception:
+            # PyObjC not available or other issue; ignore silently
+            pass
 
 class GladosGUI(tk.Tk):
     def __init__(self):
         super().__init__()
         self.title("GLaDOSify")
+        _set_app_icon(self, HEAD_IMAGE_PATH)
         self.configure(bg=BG)
         # Global font/color defaults (use named font to handle space in family name)
         self._ui_font = tkfont.Font(family="Lucida Console", size=12)