| Petritsi | |
| Name Local: | Πετρίτσι |
| Type: | municipal unit |
| Periph: | Central Macedonia |
| Periphunit: | Serres |
| Pop Municunit: | 3900 |
| Population As Of: | 2021 |
| Area Municunit: | 253.1 |
| Coordinates: | 41.2667°N 41°W |
| Licence: | ΕΡ |
Petritsi (Greek, Modern (1453-);: 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,[1] with a population of 3,900 (2021). The municipal unit has an area of 253.075 km2.[2] The seat of the municipality was in Neo Petritsi.
The settlement is served by Petritsi railway station on the Thessaloniki-Alexandroupoli line, with daily services to Thessaloniki and Alexandroupolis.