Brian Stuart Johnston (born 13 November 1958 in Dunedoo, New South Wales) is an Australian former rugby league footballer and administrator.
He played with the St George Dragons and represented for the Australian national rugby league team on one occasion.
Johnston assumed the St George captaincy in 1989 but retired at the beginning of the 1990 season because of injury.
Johnston drew criticism of his handling of the sacking of Craig Gower for misbehaviour in the week before the Test.
Encyclopedia of Rugby League Players, St George/Illawarra edition, Alan Whiticker & Glen Hudson