| Saint-Piat | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Saint-Piat (Eure-et-Loir).svg |
| Arrondissement: | Chartres |
| Canton: | Épernon |
| Insee: | 28357 |
| Postal Code: | 28130 |
| Mayor: | Michael Blanchet[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Portes Euréliennes d'Île-de-France |
| Coordinates: | 48.5486°N 1.5853°W |
| Elevation M: | 104 |
| Elevation Min M: | 101 |
| Elevation Max M: | 162 |
| Area Km2: | 11.29 |
Saint-Piat (in French pronounced as /sɛ̃ pja/) is a commune in the Eure-et-Loir department in northern France.