List of aircraft carriers of Germany

The German navies—the Kaiserliche Marine, the Reichsmarine, and the Kriegsmarine—all planned to build aircraft carriers, though none would ever enter service. These ships were based on knowledge gained during experimentation with seaplane tenders operated by the Kaiserliche Marine during World War I. Among these were the light cruiser SMS Stuttgart, which was converted to carry three seaplanes, and the armored cruiser Roon, which was to have carried four.

Source: Wikipedia — List of aircraft carriers of Germany (CC BY-SA 4.0)