| Chavenay | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason Chavenay.svg |
| Arrondissement: | Saint-Germain-en-Laye |
| Canton: | Saint-Cyr-l'École |
| Insee: | 78152 |
| Postal Code: | 78450 |
| Mayor: | Myriam Brenac[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 48.8544°N 1.9872°W |
| Elevation M: | 100 |
| Elevation Min M: | 71 |
| Elevation Max M: | 129 |
| Area Km2: | 6.03 |
Chavenay (in French pronounced as /ʃavnɛ/), also known as Vallon de Chavenay, is a commune in the Yvelines department in the Île-de-France region in north-central France. It is located close to Saint-Nom-la-Bretèche, Saint-Germain-en-Laye, and Versailles.
Along with Crespières, Feucherolles and Saint-Nom-la-Bretèche Chavenay is twinned with Rösrath, Germany.