Usaya is a village in Ushachy Raion, in Vitebsk Region, Belarus. Usaya lies at 143 m above sea level. It has 11 inhabitants. The nearest city is Polotsk, 38 km to the northwest. Among the landmarks around are Ula Castle (13.3 km), Krasny Castle (9.5 km) and Church of Holy Trinity (13.4 km).

Also written Усая.