Björn Dunkerbeck (born 16 July 1969) is a professional windsurfer who has won Professional Windsurfers Association (PWA) Overall World Championships a record forty one times.
Dunkerbeck is the son of a Dutch father and a Danish mother, but sailed under the number E-11, as he grew up in the volcanic archipelago of Canary Islands in Spain.
He dominated the late 1980s and the entire 1990s professional scene, especially in racing, but was also a champion in wavesailing.
He currently sails under the Swiss flag (SUI-11).
Both he and his sister Britt have held records for the World Sailing Speed Record Council Nautical Mile.