| Gastins | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Gastins (Seine-et-Marne).svg |
| Coordinates: | 48.6294°N 3.0217°W |
| Insee: | 77201 |
| Postal Code: | 77370 |
| Arrondissement: | Provins |
| Canton: | Nangis |
| Mayor: | Arnaud Pommier[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Brie Nangissienne |
| Elevation Min M: | 93 |
| Elevation Max M: | 139 |
| Area Km2: | 14.95 |
Gastins (in French pronounced as /ɡastɛ̃/) is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France.
Inhabitants are called Gastinois.