Osiek [ˈɔɕɛk] is a village in the administrative district of Gmina Pakosław, within Rawicz County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 4 kilometres (2 mi) east of Pakosław, 17 km (11 mi) east of Rawicz, and 88 km (55 mi) south of the regional capital Poznań.