Söderby is a village in Loviisa Municipality, in the region of Uusimaa, Finland. Söderby lies at 26 m above sea level. The nearest city is Karhula, 48 km to the east. Beaches nearby: Koskenkylä Beach (8.3 km). Among the landmarks around are Porvoo Cathedral (28 km), Ahvenkoski (23 km) and Pernå Church (12.4 km).