Guy Favreau PC QC (20 May 1917 – 11 July 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.

Allegations regarding involvement in the prison escape of Lucien Rivard had led to his downfall as Attorney General.

[1] He was appointed a judge of the Quebec Superior Court on April 17, 1967, but he died shortly afterward.

[2] The Complexe Guy-Favreau, the federal government's main building in Montreal, was built in 1983 and is named in his honour.