Ashley John Brehaut (born 18 September 1980) is a male badminton player from Australia. His coach is Ning On Sze, and he lives in Ballarat, Victoria, Australia.
Brehaut competed in badminton at the 2004 Summer Olympics in men's doubles with partner Travis Denney. They were defeated in the round of 32 by Pramote Teerawiwatana and Tesana Panvisvas of Thailand. In 2006, he and Denney won the bronze medal at the Oceania Championships, and also competed at the Commonwealth Games. His brother Stuart is also a former Olympic badminton player.