Osówka [ɔˈsufka] is a village in the administrative district of Gmina Sienno, within Lipsko County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) south-east of Sienno, 13 km (8 mi) south-west of Lipsko, and 134 km (83 mi) south of Warsaw.