| Lain | |
| Commune Status: | Commune |
| Coordinates: | 47.6189°N 3.3456°W |
| Insee: | 89215 |
| Postal Code: | 89560 |
| Arrondissement: | Auxerre |
| Canton: | Vincelles |
| Elevation Min M: | 217 |
| Elevation Max M: | 316 |
| Area Km2: | 10.18 |
Lain (in French pronounced as /lɛ̃/) is a commune in the Yonne department in Bourgogne-Franche-Comté in north-central France, in the natural region of Forterre.