Colonel George Mackenzie (born 1931) is a former Australian Army officer.
Mackenzie was born in Melbourne and was educated at Scotch College. He joined the Australian Army shortly after graduating — his father had served in the Army in World War II — and during the Vietnam War he was stationed in Ho Chi Minh City,Saigon, where he served as the Australian Defence Force's chief legal officer.
He has served as a Shrine of Remembrance trustee, and is one of its eight life governors.