| Lassay-sur-Croisne | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr lassay sur croisne (loir-et-cher).svg |
| Arrondissement: | Romorantin-Lanthenay |
| Canton: | Selles-sur-Cher |
| Insee: | 41112 |
| Postal Code: | 41230 |
| Mayor: | François Gautry[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 47.3744°N 1.6236°W |
| Elevation M: | 100 |
| Elevation Min M: | 84 |
| Elevation Max M: | 112 |
| Area Km2: | 16.92 |
Lassay-sur-Croisne (in French pronounced as /lasɛ syʁ kʁwan/) is a commune in the Loir-et-Cher department in the administrative region of Centre-Val de Loire, France.[2]