Bruce Mather (born May 9, 1939) is a Canadian composer, pianist, and writer who is particularly known for his contributions to contemporary classical music. One of the most notable composers of microtonal music, he was awarded the Jules Léger Prize twice, first in 1979 for his Musique pour Champigny and again in 1993 for Yquem. Some of his other awards include the Composers, Authors and Publishers Association of Canada's Micheline Coulombe Saint-Marcoux prize in 1987 for Barbaresco and the Serge Garant Prize from the Émile Nelligan Foundation in 2000.
Mather is an associate of the Canadian Music Centre and a member of the Canadian League of Composers. As a writer he has contributed works to numerous musical journals and publications, including authoring the articles on Serge Garant, François Morel, and Gilles Tremblay in the Dictionary of Contemporary Music. He has taught on the music faculties of the University of Toronto (1964–1966), the University of Montreal (1970–1973), the Paris Conservatoire (1978–1979) and McGill University (1966–2001). His notable pupils include, Marc Patch, Peter Allen, John Burke, Paul Crawford, Jacques Desjardins, José Evangelista, Anthony Genge, Richard Hunt, Denis Lorrain, John Oliver, François Rose, Ronald Bruce Smith, Donald Steven, and Alexander Tilley.