Gregory John Brehaut (1 August 1946 – 19 February 1993) was an Australian rules football player and coach who played with the Perth Football Club in the Western Australian National Football League (WANFL) and the Woodville Football Club in the South Australian National Football League (SANFL). Playing mainly as a wingman, he also represented Western Australia in 16 interstate matches, and later coached the East Perth Football Club between 1983 and 1986, before dying in 1993 at the age of 46 from a heart attack. Brehaut was posthumously inducted into the West Australian Football Hall of Fame in 2006.