Margaret Aileen Carroll PC (née O'Leary; June 1, 1944 – April 19, 2020) was a Canadian politician. She served as a member of the House of Commons from 1997 to 2006 who represented the ridings of Barrie—Simcoe—Bradford and Barrie. She served in the cabinet of Prime Minister Paul Martin as Minister for International Cooperation. From 2007 to 2011 she was a Liberal member of the Legislative Assembly of Ontario. She served in the cabinet of Premier Dalton McGuinty as Minister of Culture.