| Mersuay | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason Bourgogne-comté ancien(aigle).svg |
| Coordinates: | 47.7833°N 6.1394°W |
| Insee: | 70343 |
| Postal Code: | 70160 |
| Arrondissement: | Vesoul |
| Canton: | Port-sur-Saône |
| Mayor: | Christian Chervet[1] |
| Term: | 2024 - 2026 |
| Elevation Min M: | 216 |
| Elevation Max M: | 256 |
| Area Km2: | 11.75 |
Mersuay (in French pronounced as /mɛʁsɥɛ/) is a commune in the Haute-Saône department in the region of Bourgogne-Franche-Comté in eastern France.