Justin Maurice O'Brien (2 August 1917 â 25 January 1996) was an Australian artist. He won the inaugural Blake Prize in 1951.
O'Brien's works are held in the collections of the National Gallery of Australia, the Art Gallery of New South Wales, the National Gallery of Victoria, the Art Gallery of South Australia, the Art Gallery of Western Australia, the University of Sydney and the University of Southern Queensland.
The National Portrait Gallery in Australia holds a number of portraits of O'Brien.
O'Brien was made a Member of the Order of Australia (AM) in the 1992 Queen's Birthday Honours for service to art.
O'Brien is the subject of an Australian Broadcasting Corporation Compass television program.