Polsu is a village in Säkylä Municipality, in the region of Satakunta, Finland. Polsu lies at 43 m above sea level. The nearest city is Klaukkala, 155 km to the east. Among the landmarks around are Sammallahdenmäki (30 km), Luistari (10.4 km) and Köyliö Church (0.8 km). Among the natural features are Kuninkaanlähde (5.9 km) and Kuninkaanmänty, Köyliö (8.1 km).