| Saint-Thual | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Coordinates: | 48.3375°N -1.9325°W |
| Insee: | 35318 |
| Postal Code: | 35190 |
| Arrondissement: | Saint-Malo |
| Canton: | Combourg |
| Mayor: | Loïc Commeureuc[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Bretagne Romantique |
| Elevation Min M: | 33 |
| Elevation Max M: | 126 |
| Area Km2: | 11.40 |
Saint-Thual (in French pronounced as /sɛ̃ tɥal/; ; Gallo: Saent-Tuau) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.
Inhabitants of Saint-Thual are called Saint-Thualais in French.