(December 31, 1860 – February 12, 1941) was a Canadian Roman Catholic priest and Bishop of Sherbrooke from 1927 to 1941.

Born in Bonsecours, Canada East, Gagnon studied at the Séminaire Saint-Charles-Borromée de Sherbrooke from 1875 to 1880.

From 1895 to 1897, he studied in Paris where he received a Master of Arts degree.

Returning to Canada, he held different teaching positions at the Séminaire.

This article about a Canadian Catholic bishop is a stub.