| Smerillo | |
| Official Name: | Comune di Smerillo |
| Coordinates: | 43°N 40°W |
| Region: | Marche |
| Province: | Fermo (FM) |
| Frazioni: | Castorano, Cersola, San Martino al Faggio |
| Mayor: | Egidio Ricci |
| Area Total Km2: | 11.3 |
| Population Footnotes: | [1] |
| Population Total: | 414 |
| Population As Of: | 31 December 2008 |
| Population Demonym: | Smerillesi |
| Elevation M: | 806 |
| Saint: | Sts. Peter and Paul |
| Day: | June 29 |
| Postal Code: | 63020 |
| Area Code: | 0734 |
Smerillo is a comune (municipality) in the Province of Fermo in the Italian region Marche, located about 80km (50miles) south of Ancona, about 35km (22miles) northwest of Ascoli Piceno and about 35km (22miles) west of Fermo, on a spur midway from the Monti Sibillini and the Adriatic Sea.
It houses several remains of the medieval castle and walls. Also notable are the churches of Santa Caterina and San Ruffino.