Osiek Wielki (Polish pronunciation: [ˈɔɕɛk ˈfjɛlkʲi]) is a village in the administrative district of Gmina Osiek Mały, within Koło County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 5 kilometres (3 mi) south-east of Osiek Mały, 6 km (4 mi) north of Koło, and 118 km (73 mi) east of the regional capital Poznań.