Garry David McIlwaine (born 7 October 1944) is a former Australian politician. He was a Labor member of the New South Wales Legislative Assembly, representing Yaralla from 1978 to 1981 and Ryde from 1981 to 1988. The son of Charles Victor and Leila Josephine McIlwaine, he was born in Concord West in Sydney. He attended school in the Concord area and studied law part-time at the University of Sydney, completing the course in 1969. In 1970 he was admitted to the New South Wales Bar. He had joined the Labor Party in 1965.