Henri-Louis Gagnon (September 13, 1881 – June 16, 1964) was a Canadian politician.

Born in Lambton, Quebec, the son of Louis Gagnon and Sobronie Bélanger, Gagnon was elected to the Legislative Assembly of Quebec for Frontenac in 1931.

He was re-elected in 1939 and defeated in 1944.

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