| Merry-Sec | |
| Commune Status: | Commune |
| Coordinates: | 47.6572°N 3.4858°W |
| Insee: | 89252 |
| Postal Code: | 89560 |
| Arrondissement: | Auxerre |
| Canton: | Vincelles |
| Mayor: | Monique Wlodarczyk[1] |
| Term: | 2020 - 2026 |
| Elevation Min M: | 199 |
| Elevation Max M: | 373 |
| Area Km2: | 14.17 |
Merry-Sec (in French pronounced as /meʁi sɛk/) is a commune in the Yonne department in Bourgogne-Franche-Comté in north-central France, in the natural region of Forterre.