| Follainville-Dennemont | |
| Commune Status: | Commune |
| Arrondissement: | Mantes-la-Jolie |
| Canton: | Limay |
| Insee: | 78239 |
| Postal Code: | 78520 |
| Mayor: | Sébastien Lavancier[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CU Grand Paris Seine et Oise |
| Coordinates: | 49.0214°N 1.7147°W |
| Elevation M: | 85 |
| Elevation Min M: | 16 |
| Elevation Max M: | 149 |
| Area Km2: | 9.69 |
Follainville-Dennemont (in French pronounced as /fɔlɛ̃vil dɛnmɔ̃/) is a commune in the Yvelines department in the Île-de-France in north-central France.