Fiastra is a comune (municipality) in the Province of Macerata in the Italian region Marche, located about 70 km southwest of Ancona and about 40 km 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.