Brad Mackay (born 1969 in Sydney, New South Wales) is an Australian former rugby league footballer who played in the 1980s and 1990s.
Mackay debuted for the New South Wales Blues as a reserve in game II of the 1989 State of Origin series.
1993 saw Mackay continue his good form and he was the starting lock forward for NSW in all three State of Origin games in the Blues 2–1 series win over Queensland.
Later that year he became one of only four players (the others being Bradley Clyde in 1991, Daly Cherry-Evans in 2013 and Jack Wighton in 2019) to win the Clive Churchill Medal from the losing side when the Dragons went down 6–14 in the Grand Final, again to the Brisbane Broncos.
Mackay later became part of the new St. George when the joint venture was formed in 1999, playing 24 games, including an appearance from the bench in the 1999 NRL Grand Final loss to the Melbourne Storm.