Zitadelle ("Citadel") may refer to: Spandau Citadel (German: Zitadelle Spandau), a fortress in Berlin Zitadelle (Berlin U-Bahn), a railway station serving the Spandau Citadel Zitadelle Mainz, a fortress in Mainz Operation Zitadelle, the German offensive operation for the Battle of Kursk