Dr Brenda Mary Niall AO FAHA (born 25 November 1930) is an Australian biographer, literary critic and journalist. She is particularly noted for her work on Australia's well-known Boyd family of artists and writers. Educated at Genazzano FCJ College, in Kew, Victoria, and the University of Melbourne, Niall began writing during her time as Reader in the Department of English at Monash University.