Wellesley K. Clayton (born 25 August 1938) is a Jamaican former long jumper who competed in the 1964 Summer Olympics and in the 1968 Summer Olympics.^[1]

He established himself among the Caribbean's best jumpers at the Central American and Caribbean Games, taking the silver medal in 1962, then the gold medal in 1966 – Jamaica's second ever games winner in that event, after Deryck Taylor. In 1966 he was also in Jamaica's gold medal-winning 4×100 metres relay team.^[2] He enjoyed a variety of successes at the British West Indies Championships: after a long jump bronze in 1959 and a pentathlon silver in 1960, he won two straight long jump titles in 1964 to 1965, as well as the 1964 110 metres hurdles title.^[3]

He was twice a bronze medallist in the long jump at the British Empire and Commonwealth Games, 1962 and again in 1966.^[4] He followed this with another bronze medal at the 1967 Pan American Games.^[5]