Louis-Napoléon Fortin (August 8, 1850 – March 31, 1892) was a physician and political figure in Quebec.
He represented Montmagny in the Legislative Assembly of Quebec from 1876 to 1883 as a Liberal and then Conservative member.
He was born in Cap-Saint-Ignace, the son of Louis Fortin and Marguerite Bernier.
Fortin was the grandson of Jean-Baptiste Fortin.
He was educated at the Collège de Sainte-Anne-de-la-Pocatière and the Université Laval.
He qualified to practise in 1874 and set up his practice at Cap-Saint-Ignace.
Fortier was first elected to the Quebec assembly in an 1876 by-election held after the election of Auguste-Charles-Philippe Landry was overturned.
In 1879, he joined the Conservative caucus with three other members, leading to the defeat of the Liberal government.
His election in 1881 was overturned after a decision by the Quebec Superior Court in 1883.
Fortin was mayor of Cap-Saint-Ignace from 1881 to 1883.
In 1881, he married Marie-Sophie-Laurette Larue.
He was named a colonization inspector but was dismissed from that post in 1887.