Sir Charles Benedict Ainslie, CBE (born 5 February 1977) is an English competitive sailor.
Ainslie is one of the most successful sailors in Olympic history.
He won medals at five consecutive Olympics from 1996 onwards, including gold at the four Games held between 2000 and 2012.He is one of three athletes to win medals in five different Olympic Games in sailing, being the third person to win five Olympic medals in that sport (after Torben Grael and Robert Scheidt) and also the second to win four gold medals, after Paul Elvstrøm.