| Louis Julien Demers | |
| Constituency Mp: | Lévis |
| Parliament: | Canadian |
| Predecessor: | Pierre Malcom Guay |
| Successor: | Louis Auguste Carrier |
| Term Start: | 1899 |
| Term End: | 1905 |
| Birth Date: | 9 December 1848 |
| Birth Place: | St-Romuald, Canada East |
| Death Place: | St-Romuald, Quebec |
| Party: | Liberal |
Louis Julien Demers (December 9, 1848 - April 29, 1905) was a merchant and political figure in Quebec. He represented Lévis in the House of Commons of Canada from 1899 to 1905 as a Liberal.
He was born in St-Romuald, Canada East, the son of Benjamin Demers and Felicite Carrier, and was educated at the Collège de Lévis. In 1883, he married Elmina Giroux.[1] Demers was first elected to the House of Commons in an 1899 by-election held after the death of Pierre Malcom Guay. He died in office at St-Romuald at the age of 56 after a long illness.[2]