SM U-48[Note 1] was one of the 329 submarines serving in the Imperial German Navy in World War I. U-48 was engaged in the naval warfare and took part in the First Battle of the Atlantic.

On 24 November 1917 she ran aground on Goodwin Sands.

There she was fired on by HMS Gipsy.

U-48 was scuttled and abandoned.

In violation of the Hague Conventions of 1899 and 1907, HMS Gipsy continued to fire, killing an additional 19 survivors.