Alva Merlin Colquhoun (married name Wyatt,[1] born 28 February 1942) is an Australian former freestyle and butterfly swimmer of the 1950s, who won a silver medal in the 4×100-metre freestyle relay at the 1960 Summer Olympics in Rome.

[2] She is perhaps best known for resolving a dispute at a team meeting during the Rome Olympics.

Making her first appearance for Australia at the 1958 British Empire and Commonwealth Games in Cardiff, Wales, Colquhuon combined with Dawn Fraser, Lorraine Crapp and Sandra Morgan to win the 110-yard freestyle.

[3] However, she was in the spotlight when during a team meeting, officials had ordered Fraser to swim the butterfly leg in the 4×100-metre medley relay preliminaries in place of the first-choice butterfly swimmer Jan Andrew, who was ordered to rest ahead of her individual event.

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