Margaret Olley ( 24 June, 1923, Lismore, New South Wales - 26 July, 2011, Paddington, New South Wales) was an Australian artist. She was well known for generous gifts of paintings and money to public art galleries in Australia. These gifts included works by Cezanne and Picasso. She is also famous for being the model for portraits. Two paintings of her won the Archibald Prize; William Dobell's painting in 1948, and Ben Quilty's in 2011. She was described by Julia Gillard, the Prime Minister of Australia, as a great artist and a true Australian national treasure.