Terry M. Mercer (born May 6, 1947) is a former Canadian Senator. A long-time fundraiser and organizer for the Liberal Party of Canada, Mercer was appointed to the Senate representing Nova Scotia by Prime Minister Jean Chrétien in November 2003, shortly before Prime Minister Chrétien's retirement. Mercer served as National Director of the Liberal Party during much of Chrétien's tenure as party leader. Prior to entering the charitable sector, Mercer worked as Executive Assistant to Nova Scotia's Minister of Labour and Housing from 1974 to 1978.