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.