| Marnay | |
| Commune Status: | Commune |
| Arrondissement: | Poitiers |
| Canton: | Vivonne |
| Insee: | 86148 |
| Postal Code: | 86160 |
| Mayor: | Christian Chaplain[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 46.3969°N 0.3433°W |
| Elevation M: | 120 |
| Elevation Min M: | 96 |
| Elevation Max M: | 144 |
| Area Km2: | 45.1 |
Marnay (in French pronounced as /maʁnɛ/) is a commune in the Vienne department in the Nouvelle-Aquitaine region in western France.
The Clouère flows northwest through the middle of the commune and crosses the village.