The German torpedo boat T30 was one of fifteen Type 39 torpedo boats built for the Kriegsmarine (German Navy) during World War II. Completed in late 1943, the boat was assigned to support German operations in the Baltic Sea. She laid minefields in the Gulf of Finland, off the Estonian coast, in mid-April, before she was tasked to support Finnish forces in June. The following month, T30 helped to sink a Soviet patrol boat. After a navigational error caused her to enter a German minefield as she was preparing to lay one herself in August, the boat sank after striking several mines with the loss of 137 crewmen.