| Chailly-sur-Armançon | |
| Commune Status: | Commune |
| Arrondissement: | Beaune |
| Canton: | Arnay-le-Duc |
| Insee: | 21128 |
| Postal Code: | 21320 |
| Mayor: | Bernard Chalon[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC de Pouilly-en-Auxois – Bligny-sur-Ouche |
| Coordinates: | 47.2728°N 4.4853°W |
| Elevation M: | 380 |
| Elevation Min M: | 351 |
| Elevation Max M: | 522 |
| Area Km2: | 18.65 |
Chailly-sur-Armançon (in French pronounced as /ʃaji syʁ aʁmɑ̃sɔ̃/, "Chailly-on-Armançon") is a commune in the Côte-d'Or department in the Bourgogne-Franche-Comté region in Eastern France. In 2020, it had a population of 253.