diff --git a/apps/web/e2e/admin-settings.spec.ts b/apps/web/e2e/admin-settings.spec.ts
index 2b0e2b1..8ced0c3 100644
--- a/apps/web/e2e/admin-settings.spec.ts
+++ b/apps/web/e2e/admin-settings.spec.ts
@@ -33,9 +33,10 @@ test('instance name changed in the general settings form persists', async ({ bro
     // Scoped to the card: the page has several forms with status regions.
     await expect(generalCard.getByRole('status')).toHaveText(/^(Saved\.|Gespeichert\.)$/);
 
-    // The TopBar shows the new name without a reload — the save invalidates
-    // the branding query the TopBar reads from.
+    // The TopBar and the document title show the new name without a reload —
+    // the save invalidates the branding query both read from (issue #323).
     await expect(page.locator('.topbar__brand')).toHaveText(newName);
+    await expect(page).toHaveTitle(new RegExp(`${newName}$`));
 
     // The proof the form really persisted: the value survives a reload and
     // the api returns it.
diff --git a/apps/web/src/lib/use-document-title.ts b/apps/web/src/lib/use-document-title.ts
index a3ec0a7..4d02608 100644
--- a/apps/web/src/lib/use-document-title.ts
+++ b/apps/web/src/lib/use-document-title.ts
@@ -1,22 +1,33 @@
 import { useEffect } from 'react';
 
+import { useBranding } from '../branding/use-branding';
+
 const APP_NAME = 'Dorfteich';
 
 /**
  * Route-specific document title (issue #163, WCAG 2.4.2): joins the given
- * parts with the app name ("Page — Pond — Dorfteich"). Empty/undefined
+ * parts with the instance name ("Page — Pond — My Wiki"). Empty/undefined
  * parts are skipped, so callers can pass still-loading data directly.
- * Falls back to the bare app name on unmount.
+ * Falls back to the bare instance name on unmount.
+ *
+ * The trailing name is the OPERATOR'S instance name, not the product name
+ * (issue #323) — same reasoning as the TopBar brand (issue #306). Until
+ * the branding query resolves (or when it cannot, e.g. maintenance mode)
+ * the shipped default keeps the title stable, so an untouched instance
+ * reads exactly as before.
  */
 export function useDocumentTitle(...parts: (string | null | undefined)[]): void {
-  const joined = [...parts.filter(Boolean), APP_NAME].join(' — ');
+  const appName = useBranding()?.instanceName.trim() || APP_NAME;
+  const joined = [...parts.filter(Boolean), appName].join(' — ');
   useEffect(() => {
     document.title = joined;
   }, [joined]);
   useEffect(
+    // On unmount only in effect: `joined` always changes with `appName`,
+    // so the title effect above re-runs right after this cleanup.
     () => () => {
-      document.title = APP_NAME;
+      document.title = appName;
     },
-    [],
+    [appName],
   );
 }