Osa is a village in Kobryn Raion, in Brest Region, Belarus. Osa lies at 151 m above sea level. It has 238 inhabitants. The nearest city is Kobryn, 34 km to the northwest. Among the landmarks around are Saint Paraskeva Orthodox church in Dzivin (7.4 km), Orthodox church of the Nativity of Our Lady in Dzivin (7.5 km) and Church of the Intercession of Our Lady in Chabovičy (15.9 km).
Also written Воса.