SMS V191 was a S-138-class large torpedo boat of the Imperial German Navy. She was built by the AG Vulcan shipyard at Stettin between 1910 and 1911 and launched on 2 June 1911. V191 took part the First World War. She was present at the Battle of Heligoland Bight in August 1914. She was sunk when she struck a Russian mine in the Baltic on 17 December 1915