Clarence Alphonse Gagnon,(November 8, 1881 – January 5, 1942) was a French Canadian painter, draughtsman, engraver and illustrator, from the province of Quebec. He is well known for his landscape paintings of the Laurentians and the Charlevoix region of eastern Quebec.
Gagnon died on January 5, 1942 at the Royal Victoria Hospital in Montreal. He is buried at the Notre-Dame-des-Neiges Cemetery in Montreal. A bust has been erected in his memory by the Galerie Clarence Gagnon in Quebec City.