Étienne Guy (February 16, 1774 – December 29, 1820) was a surveyor and political figure in Lower Canada. He was born in Montreal in 1774, the son of , studied at the Collège Saint-Raphaël and then spent over a year at the College of New Jersey. In 1796, he was elected to the Legislative Assembly of Lower Canada in . Guy qualified to practice as a surveyor in 1798. He also served in the local militia during the War of 1812, later becoming lieutenant colonel.