| Chapet | |
| Commune Status: | Commune |
| Arrondissement: | Mantes-la-Jolie |
| Canton: | Les Mureaux |
| Insee: | 78140 |
| Postal Code: | 78130 |
| Mayor: | Benoît de Laurens[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CU Grand Paris Seine et Oise |
| Coordinates: | 48.9672°N 1.9344°W |
| Elevation M: | 59 |
| Elevation Min M: | 29 |
| Elevation Max M: | 121 |
| Area Km2: | 5.10 |
Chapet (pronounced as /fr/) is a commune in the Yvelines department in the Île-de-France region in north-central France, about 16 km east of Mantes-la-Jolie. It is on the Normandy motorway (A13).
The commune's neighbours are Verneuil-sur-Seine to the northeast, to the east is Vernouillet, with Morainvilliers to the southeast, Ecquevilly to the southwest, and to the northwest is Les Mureaux.
It is a largely rural and agricultural community; the land is divided mainly between arable crops (cereals, oilseed rape) with some woods and forest.
The parish church of Saint-Denis dates from the 12th century. The bell-tower was added in 1859.