Osiek [ˈɔɕɛk] is a village in the administrative district of Gmina Koziegłowy, within Myszków County, Silesian Voivodeship, in southern Poland. It lies approximately 6 kilometres (4 mi) south-east of Koziegłowy, 7 km (4 mi) west of Myszków, and 39 km (24 mi) north-east of the regional capital Katowice.