Erik, Duke of Mecklenburg

Erik, Duke of Mecklenburg (c. 1367/1368 – 26 July 1397) was the eldest son and heir apparent of Albert, King of Sweden. Erik played a significant role in his father's attempts to secure and reclaim the Swedish throne. Erik and Albert were defeated in battle of Åsle in 1389 and imprisoned by Queen Margaret I of Denmark. They were released in 1395 against a ransom guaranteed by the Hanseatic League.

Albert tried to regain the Swedish crown by sending Erik to conquer Gotland in 1396. Erik briefly became the ruler of Gotland. His death in 1397 led to the loss of Gotland from Mecklenburg to pirates, who were later conquered by the Teutonic Order.