| Marcetelli | |
| Official Name: | Comune di Marcetelli |
| Coordinates: | 42.2333°N 16°W |
| Region: | Lazio |
| Province: | Rieti (RI) |
| Mayor: | Daniele Raimondi |
| Area Total Km2: | 11.08 |
| Population Footnotes: | [1] |
| Population Total: | 78 |
| Population As Of: | 30 September 2017 |
| Population Demonym: | Marcetellani |
| Elevation M: | 930 |
| Postal Code: | 02020 |
| Area Code: | 0765 |
Marcetelli (Italian: label=[[Sabino dialect|Sabino]]|Marcitelli) is a Italian: [[comune]] (municipality) in the Province of Rieti in the Italian region of Latium, located about 60km (40miles) northeast of Rome and about 25km (16miles) southeast of Rieti.
Marcetelli borders the following municipalities: Ascrea, Collalto Sabino, Collegiove, Paganico Sabino, Pescorocchiano, Varco Sabino.
By number of inhabitants, it is the smallest municipality in Lazio and among the smallest in Italy.