Joseph-Georges-Gilles-Claude Lamontagne (; April 17, 1919 – June 14, 2016) was a Canadian retired politician. He served as the 24th Lieutenant Governor of Quebec from March 28, 1984 through August 9, 1990. Before, he served as Mayor of Quebec City from December 1, 1965 through December 1, 1977. He retired in 1990.