Dr Brenda Niall AO (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.In June 2004 she was appointed an Officer of the Order of Australia for 'services to Australian literature, as an academic, biographer and literary critic'.