| Fiastra | |
| Official Name: | Comune di Fiastra |
| Coordinates: | 43.0333°N 22°W |
| Region: | Marche |
| Province: | Macerata (MC) |
| Frazioni: | Acquacanina, Collesanto, Polverina, San Lorenzo al Lago, Cicconi, Fiegni, San Martino di Fiastra, Trebbio (communal seat) |
| Mayor: | Claudio Castelletti |
| Area Total Km2: | 57.8 |
| Population Footnotes: | [1] |
| Population Total: | 543 |
| Population As Of: | 30 November 2016 |
| Population Demonym: | Fiastrani |
| Elevation M: | 732 |
| Postal Code: | 62033 |
| Area Code: | 0737 |
Fiastra is a comune (municipality) in the Province of Macerata in the Italian region Marche, located about 70km (40miles) southwest of Ancona and about 40km (30miles) southwest of Macerata.
Fiastra borders the following municipalities: Camerino, Cessapalombo, Fiordimonte, Pievebovigliana, San Ginesio, Sarnano. On 1 January 2017, it incorporated the former commune of Acquacanina.
Among the churches is that of San Paolo.