| Colleretto Castelnuovo | |
| Official Name: | Comune di Colleretto Castelnuovo |
| Coordinates: | 45.4167°N 48°W |
| Region: | Piedmont |
| Metropolitan City: | Turin (TO) |
| Mayor: | Marina Carlevato |
| Area Total Km2: | 6.3 |
| Population Total: | 358 |
| Population As Of: | 31 December 2010[1] |
| Population Demonym: | Collerettesi |
| Elevation M: | 585 |
| Postal Code: | 10080 |
| Area Code: | 0124 |
Colleretto Castelnuovo is a comune (municipality) in the Metropolitan City of Turin in the Italian region of Piedmont, located about 40km (30miles) north of Turin.
Colleretto Castelnuovo borders the following municipalities: Castellamonte, Cintano, Borgiallo, and Castelnuovo Nigra.