Opaka Duża [ɔˈpaka ˈduʐa] is a village in the administrative district of Gmina Czeremcha, within Hajnówka County, Podlaskie Voivodeship, in north-eastern Poland, close to the border with Belarus. It lies approximately 8 kilometres (5 mi) east of Czeremcha, 24 km (15 mi) south of Hajnówka, and 68 km (42 mi) south of the regional capital Białystok.