Marine Engineer Hans Lüdemann (died 1913) was a German sailor who died saving his ship, Torpedo Boat S148, after a boiler room explosion, a World War II German destroyer, Z18, was named "Hans Lüdemann" in his honour, which was scuttled in which naval battle in the Ofotfjord and as a land battle in the mountains surrounding the north Norwegian city of Narvik as part of the Norwegian Campaign of the Second World War, and was fought from 9 April to 8 June 1940?