diff --git a/electron-builder.yml b/electron-builder.yml
index 38b05265..f0336c3a 100644
--- a/electron-builder.yml
+++ b/electron-builder.yml
@@ -7,9 +7,11 @@ directories:
 files:
   - out/**/*
   - package.json
+  - resources/icon.png
 asar: true
 mac:
   category: public.app-category.business
+  icon: resources/icon-mac.png
   hardenedRuntime: true
   gatekeeperAssess: false
   entitlements: resources/entitlements.mac.plist
@@ -24,6 +26,7 @@ mac:
         - x64
         - arm64
 win:
+  icon: resources/icon.ico
   target:
     - target: nsis
       arch:
diff --git a/resources/icon-mac.png b/resources/icon-mac.png
new file mode 100644
index 00000000..70a0788d
Binary files /dev/null and b/resources/icon-mac.png differ
diff --git a/resources/icon.ico b/resources/icon.ico
new file mode 100644
index 00000000..87876920
Binary files /dev/null and b/resources/icon.ico differ
diff --git a/resources/icon.png b/resources/icon.png
index 9741695c..516ee5e8 100644
Binary files a/resources/icon.png and b/resources/icon.png differ
diff --git a/src/main/app/create-window.ts b/src/main/app/create-window.ts
index 2f1406a4..7637a22b 100644
--- a/src/main/app/create-window.ts
+++ b/src/main/app/create-window.ts
@@ -15,6 +15,9 @@ export function createMainWindow(options: CreateWindowOptions): BrowserWindow {
     minWidth: 980,
     minHeight: 700,
     title: "AgentCompany",
+    // macOS takes the window image from the app bundle; Windows and Linux
+    // want it on the window itself (dev runs included).
+    ...(process.platform === "darwin" ? {} : { icon: join(__dirname, "../../resources/icon.png") }),
     show: false,
     titleBarStyle: process.platform === "darwin" ? "hiddenInset" : "hidden",
     webPreferences: {