The Treaty of Stralsund (, 24 May 1370) ended the Second Danish-Hanseatic War between the Hanseatic League and the Kingdom of Denmark. The Hanseatic League reached the peak of its power by the conditions of this treaty.thumb|Denmark's humiliation by the German Hansa League, i Stralsund 1370. By [[Ernst Keil in 1864.|left|204x204px]]
The war began in 1361 when Danish king Valdemar Atterdag conquered Scania, Öland, and Gotland with the major Hanseatic town Visby.