| Chasnans | |
| Coordinates: | 47.0869°N 6.3142°W |
| Insee: | 25128 |
| Postal Code: | 25580 |
| Arrondissement: | Pontarlier |
| Canton: | Valdahon |
| Commune: | Les Premiers-Sapins |
| Elevation Min M: | 648 |
| Elevation Max M: | 910 |
| Area Km2: | 7.87 |
| Population: | 271 |
| Population Date: | 2019 |
| Population Footnotes: | [1] |
Chasnans (in French pronounced as /ʃanɑ̃/) is a former commune in the Doubs department in the Bourgogne-Franche-Comté region in eastern France.
On 1 January 2016, Athose, Chasnans, Hautepierre-le-Châtelet, Nods, Rantechaux and Vanclans merged becoming one commune called Les Premiers-Sapins.