Greg Brehaut is a former Australian rules footballer who played 157 games for Perth in the WANFL during the 1960s and early 1970s.
Brehaut, a physically aggressive wingman, was with Perth from 1965 to 1973. Over this time he was part of a strong Perth side and played in their 1966, 1967 and 1968 premiership treble. He captain and coached South Australian club Woodville in 1974 before returning to Perth for one final season. Twenty-four years after retiring, Brehaut was named as a wingman in Perth's official 'Team of the Century'.
At interstate level he was a regular Western Australian representative and played most of his 16 games in the 1966, 1969 and 1972 carnivals. He performed particularly well at the 1969 Adelaide Carnival and was selected in the All-Australian team.