The 5.5 Metre World Championship are international sailing regatta in the 5.5 Metre class organized by the host club and the and recognized by the World Sailing. The most titles have been won by Norwegian sailor Kristian Nergaard, with eleven titles between 1990 and 2020 and another six silver medals. The second most titles have been won by Swiss sailor Flavio Marazzi and Swedish sailor Johan Barne, both with six. The most championships have been won by Swiss sailors, with 20 editions, followed by Norwegian sailors, with eleven titles, and sailors of USA (ten).