| Octave Magnan | |
| Office: | Member of the Legislative Assembly of Quebec for Montcalm |
| Predecessor: | Louis-Gustave Martin |
| Successor: | Jean-Baptiste-Tréfflé Richard |
| Term Start: | 1878 |
| Term End: | 1881 |
| Predecessor2: | Joseph-Alcide Martin |
| Successor2: | Pierre-Julien-Léonidas Bissonnette |
| Term Start2: | 1892 |
| Term End2: | 1897 |
| Birth Date: | 23 April 1836 |
| Birth Place: | Saint-Jacques, Lower Canada |
| Death Place: | Saint-Jacques, Quebec |
| Party: | Conservative |
Octave Magnan (April 23, 1836 - May 7, 1921) was a former farmer and political figure in Quebec. He represented Montcalm in the Legislative Assembly of Quebec from 1878 to 1881 and from 1892 to 1897 as a Conservative.
He was born in Saint-Jacques, Lower Canada, the son of Gabriel Magnan and Rosalie Brouillet, and was educated at Saint-Alexis. In 1858, he married Odile Duval at Saint-Alexis. He ran unsuccessfully for the Quebec assembly seat in Montcalm in an 1874 by-election. He was elected in 1878 and defeated by Jean-Baptiste-Tréfflé Richard when he ran for reelection in 1881. Magnan was elected again in 1892 and defeated by Pierre-Julien-Léonidas Bissonnette in 1897. He also ran unsuccessfully for a seat in the House of Commons in 1882 and 1891. He died in Saint-Jacques at the age of 85.