Stimigliano is a comune (municipality) in the Province of Rieti in the Italian region of Latium, located about 45 kilometres (28 mi) north of Rome and about 25 kilometres (16 mi) southwest of Rieti. As of 1 January 2018, it had a population of 2,321 and an area of 11.4 square kilometres (4.4 mi²).

Stimigliano borders the following municipalities: Collevecchio, Forano, Ponzano Romano, Sant'Oreste, Tarano.