| Courtois-sur-Yonne | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason de la ville de Courtois-sur-Yonne (Yonne).svg |
| Coordinates: | 48.2269°N 3.2561°W |
| Insee: | 89127 |
| Postal Code: | 89100 |
| Arrondissement: | Sens |
| Canton: | Pont-sur-Yonne |
| Mayor: | Eric Berthault[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Grand Sénonais |
| Elevation Min M: | 62 |
| Elevation Max M: | 172 |
| Area Km2: | 4.29 |
Courtois-sur-Yonne (in French pronounced as /kuʁtwa syʁ jɔn/, literally Courtois on Yonne) is a commune in the Yonne department in Bourgogne-Franche-Comté in north-central France.