Mary Elizabeth Fairfax, AC, OBE (formerly Symonds, born Marie Wein; 15 August 1922 – 17 September 2017) was a Polish-born Australian businesswoman and philanthropist. As the third wife of wealthy media proprietor Sir Warwick Fairfax, she became known as Lady Fairfax upon his knighthood in 1967. She inherited most of his vast fortune upon his death in January 1987, becoming one of Australia's richest women.