List of Austro-Hungarian U-boats

The Austro-Hungarian Navy (Kaiserliche und Königliche Kriegsmarine, shortened to k.u.k. Kriegsmarine) built a series of U-boats between 1907 and 1918 to defend its coastline and project naval power into the Adriatic and Mediterranean Seas in wartime.

Source: Wikipedia — List of Austro-Hungarian U-boats (CC BY-SA 4.0)