| Castiglioncello del Trinoro | |
| Coordinates: | 42.9914°N 11.8131°W |
| Province: | Siena (SI) |
| Comune: | Sarteano |
| Elevation M: | 786 |
| Population Total: | 14 |
| Population As Of: | 2016 |
| Gentilic: | Castiglioncellesi |
Castiglioncello del Trinoro is a village in Tuscany, central Italy, administratively a frazione of the comune of Sarteano, province of Siena. At the time of the 2016 its population was 14.[1]
Castiglioncello del Trinoro is about 70 km from Siena and 6 km from Sarteano.