Alva Colquhuon (born 30 March 1942) is a former Australian freestyle and butterfly swimmer of the 1950s, who won a silver medal in the 4 × 100 m freestyle relay at the 1960 Rome Olympics. However, she was unfortunately 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 yd freestyle. In the 110yd freestyle, she was beaten into third place by her teammates Fraser and Crapp. In Rome, she anchored the team of Fraser, Crapp and Ilsa Konrads to a silver medal, trailing the United States by 2.4 s. However she was in the spotlight when during a team meeting, officials had ordered Fraser to swim the butterfly leg in the 4 × 100 m medley relay preliminaries in place of the first-choice butterfly swimmer Jan Andrew, who was ordered to rest ahead of her individual event. Fraser refused, hitting Andrew with a pillow. It was only when Colquhuon volunteered that the dispute was resolved. However, she was replaced by Andrew in the final.