Deirdre Mary Grusovin AM (born 1 September 1938) was a Labor member of the New South Wales Parliament for over twenty five years. Grusovin was born Deirdre Mary Brereton in Sydney, and is the sister of influential former politician Laurie Brereton. She was educated at Our Lady of the Sacred Heart College in Kensington. Prior to entering politics, she was a librarian for the City of Randwick from 1957 to 1962 and then managed her husband's pharmacy business until 1978.