| Châtillon-sur-Chalaronne | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Châtillon-sur-Chalaronne (Ain).svg |
| Arrondissement: | Bourg-en-Bresse |
| Canton: | Châtillon-sur-Chalaronne |
| Insee: | 01093 |
| Postal Code: | 01400 |
| Mayor: | Patrick Mathias[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Dombes |
| Coordinates: | 46.1167°N 4.9667°W |
| Elevation M: | 225 |
| Elevation Min M: | 215 |
| Elevation Max M: | 274 |
| Area Km2: | 17.86 |
Châtillon-sur-Chalaronne (pronounced as /fr/, literally Châtillon on Chalaronne) is a commune in the Ain department in eastern France.
The town takes its name from a castle built around 1000 AD. It was formerly named Châtillon-les-Dombes.
The Chalaronne flows northwest through the commune and crosses the town. It flows into the Saône from the left, between Saint-Didier-sur-Chalaronne and Thoissey.
botanist, born in Châtillon in 1727