| Mazet-Saint-Voy | |
| Commune Status: | Commune |
| Arrondissement: | Yssingeaux |
| Canton: | Mézenc |
| Mayor: | Alain Debard[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 45.0478°N 4.245°W |
| Elevation M: | 1040 |
| Elevation Min M: | 875 |
| Elevation Max M: | 1283 |
| Area Km2: | 45.02 |
| Insee: | 43130 |
| Postal Code: | 43520 |
Mazet-Saint-Voy (in French pronounced as /mazɛ sɛ̃ vwa/; Occitan (post 1500);: Maset de Sent Vòi) is a commune in the Haute-Loire department in south-central France.
The river Lignon du Velay flows through the commune.