Louis Duhamel (January 1, 1835 – October 27, 1915) was a Canadian physician and political figure in Quebec.
He represented Ottawa electoral district in the Legislative Assembly of Quebec from 1875 to 1886 as a Conservative member.
He was born Roch Duhamel in Verchères, Lower Canada, the son of François Duhamel and Josephte Audet, and was educated at the Collège d'Ottawa and McGill University, qualifying to practice as a doctor in 1860.
He was married twice: to Félonise Bel in 1862 and to Ézilda Mazurette dit Lapierre, the widow of Césaire Thérien, in 1901.
Duhamel's residence in Hull later became the Chez Henri hotel, declared a historic monument by the city of Gatineau in 2003.