The 2011 Ironman World Championship was held on October 8, 2011, in Kailua-Kona, Hawaii and won by Craig Alexander of Australia and Chrissie Wellington of England. It was the 35th such Ironman Triathlon World Championships, which has been held annually in Hawaii since 1978, with an additional race in 1982. The championship is organised by the World Triathlon Corporation (WTC).