| Castagniers | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Castagniers (Alpes-Maritimes).svg |
| Arrondissement: | Nice |
| Canton: | Tourrette-Levens |
| Insee: | 06034 |
| Postal Code: | 06670 |
| Demonym: | Castagnérenques |
| Mayor: | Jean-François Spinelli[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Métropole Nice Côte d'Azur |
| Coordinates: | 43.7922°N 7.2322°W |
| Elevation M: | 382 |
| Elevation Min M: | 68 |
| Elevation Max M: | 881 |
| Area Km2: | 7.52 |
Castagniers (pronounced as /fr/; oc|Castanhiers; it|Castagnera) is a commune in the Alpes-Maritimes department in southeastern France.
Castagniers is one of sixteen villages grouped together by the Métropole Nice Côte d'Azur tourist department as the Route des Villages Perchés (Route of Perched Villages). The others are: Aspremont, Carros, Coaraze, Colomars, Duranus, Èze, Falicon, La Gaude, Lantosque, Levens, La Roquette-sur-Var, Saint-Blaise, Saint-Jeannet, Tourrette-Levens and Utelle.[2]