| Châtillon-en-Michaille | |
| Image Coat Of Arms: | Blason ville fr Chatillon en Michaille (Ain).svg |
| Arrondissement: | Nantua |
| Canton: | Bellegarde-sur-Valserine |
| Insee: | 01091 |
| Postal Code: | 01200 |
| Commune: | Valserhône |
| Coordinates: | 46.1453°N 5.8006°W |
| Elevation M: | 520 |
| Elevation Min M: | 373 |
| Elevation Max M: | 1241 |
| Area Km2: | 37.63 |
| Population: | 3973 |
| Population Date: | 2021 |
| Population Footnotes: | [1] |
Châtillon-en-Michaille (pronounced as /fr/; frp|Châtelyon) is a former commune in the Ain department in eastern France. On 1 January 2019, it was merged into the new commune of Valserhône.[2]