| Joseph Poirier | |
| Office: | Member of the Legislative Assembly of Quebec for Beauce |
| Predecessor: | François-Xavier Dulac |
| Successor: | Jean Blanchet |
| Term Start: | 1878 |
| Term End: | 1881 |
| Predecessor2: | Jean Blanchet |
| Successor2: | Henri Sévérin Béland |
| Term Start2: | 1892 |
| Term End2: | 1897 |
| Birth Date: | 21 December 1839 |
| Birth Place: | Saint-Joseph-de-Beauce, Lower Canada |
| Death Place: | Saint-Joseph-de-Beauce, Quebec |
Joseph Poirier (December 21, 1839 - February 27, 1917) was a farmer and politician in Quebec. He represented Beauce in the Legislative Assembly of Quebec from 1878 to 1881 as a Liberal and from 1892 to 1897 as a Conservative member.
He was born in Saint-Joseph-de-Beauce, Quebec, the son of Vital Poirier and Marie-des-Anges Thibodeau. Poirier studied at the college in Nicolet. In 1863, he married Marie-Agnès Poulin. In 1879, he married Lucie Dupuis after his first wife's death. Poirier ran unsuccessfully for a seat in the House of Commons in 1884 and 1887. He also served as secretary-treasurer for Saint-Joseph municipality. In 1897, he resigned his seat to accept the position of sheriff for Beauce district. Poirier died at Saint-Joseph-de-Beauce at the age of 77.