Petrina () is a village and a community in the municipal unit of Falaisia, Arcadia, Greece. It is situated in the northern foothills of the Taygetus mountains. It is 3 km east of Falaisia, 4 km west of Skortsinos, 4 km south of Voutsaras, 7 km southeast of Leontari and 14 km southeast of Megalopoli. The community includes the village Spanaiika.
In 2014 the US TV show Finding Your Roots found that Tina Fey have ancestors from this village.