| Matthias Rioux | |
| Birth Date: | 29 March 1934 |
| Birth Place: | Rivière-à-Claude, Quebec |
| Residence: | Rivière-à-Claude, Quebec |
| Office: | MNA for Matane |
| Term Start: | 1994 |
| Term End: | 2003 |
| Successor: | Nancy Charest |
Matthias Rioux (born March 29, 1934) is a Canadian politician who represented the electoral district of Matane in the National Assembly of Quebec from 1994 to 2003 as a member of the Parti Québécois.