| Joseph Fontaine | |
| Birthname: | Joseph Louis Rosario Fontaine |
| Birth Date: | 1900 8, df=yes |
| Birth Place: | Saint-Damase, Quebec |
| Death Place: | Saint-Hyacinthe, Quebec |
| Spouse: | Florentine Girard (m. 9 January 1922)[1] |
| Riding: | Saint-Hyacinthe—Bagot |
| Term Start: | June 1945 |
| Term End: | June 1957 |
| Profession: | master butcher, farmer, merchant |
| Party: | Liberal |
Joseph Louis-Rosario Fontaine (26 August 1900 – 16 October 1986) was a Liberal party member of the House of Commons of Canada. He was born at Saint-Damase, Quebec. He was a master butcher, meat cutter, farmer and merchant by career.
Fontaine was mayor of Notre-Dame-de-Saint-Hyacinthe parish between 1938 and 1952. He was first elected to Parliament at the St. Hyacinthe—Bagot riding in the 1945 general election. With a minor spelling change to the riding in 1947, he was re-elected at Saint-Hyacinthe—Bagot in 1949 and 1953. He was defeated by Théogène Ricard of the Progressive Conservative party in the 1957 election.