| Born: | June 21, 2003 | Draft: | Undrafted |
| Hometown: | Ste-Marthe-sur-le-Lac, QC | Position: | Defenseman |
| Known For: | Shoots: | Left | |
| National Team: | Canada | Current Team: | Saint John Sea Dogs |
Mathis Gauthier (born June 21, 2003) is a Canadian-born ice hockey defenseman who plays for the Saint John Sea Dogs of the Quebec Major Junior Hockey League (QMJHL).