Geoffrey Stewart (Geoff) Irwin (born 30 March 1948) is an Australian politician. He was a Labor member of the New South Wales Legislative Assembly from 1984 to 1995.Irwin was first elected to state parliament at the 1984 state election as the Labor member for the safe seat of Merrylands. His district was abolished at the 1988 state election, at which point he transferred to the similarly safe seat of Fairfield.