Petritsi (Greek: Πετρίτσι) is a former municipality in the Serres regional unit, Greece. Since the 2011 local government reform it is part of the municipality Sintiki, of which it is a municipal unit, with a population of 3,900 (2021). The municipal unit has an area of 253.075 km. The seat of the municipality was in Neo Petritsi.

Transport

The settlement is served by Petritsi railway station on the Thessaloniki-Alexandroupoli line, with daily services to Thessaloniki and Alexandroupolis.