Kownaciska [kɔvnaˈt͡ɕiska] is a village in the administrative district of Gmina Suchożebry, within Siedlce County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) east of Suchożebry, 11 km (7 mi) north-east of Siedlce, and 91 km (57 mi) east of Warsaw.