Guy Favreau, PC QC (May 20, 1917 – July 11, 1967) was a Canadian lawyer, politician and judge. Born in Montreal, Quebec, the son of Léopold Favreau and Béatrice Gagnon, he obtained a Bachelor of Arts and an LL.B. from the Université de Montréal. He was called to the Bar of Quebec in 1940. He worked as a lawyer in Montreal from 1942 to 1952. In 1952, he became a member of the Restrictive Trade Practices Commission in Ottawa. In 1955, he became Assistant Deputy Minister of Justice. He helped to create the Faculty of Civil Law at the University of Ottawa and taught there as well. In 1960, he returned to Montreal to work as a private lawyer.