Kosiska [kɔˈɕiska] is a village in the administrative district of Gmina Wądroże Wielkie, within Jawor County, Lower Silesian Voivodeship, in south-western Poland.

It lies approximately 6 km (4 mi) east of Wądroże Wielkie, 19 km (12 mi) north-east of Jawor, and 44 km (27 mi) west of the regional capital Wrocław.