Kiełczynek [kʲɛu̯ˈt͡ʂɨnɛk] is a village in the administrative district of Gmina Książ Wielkopolski, within Śrem County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 2 kilometres (1 mi) west of Książ Wielkopolski, 14 km (9 mi) east of Śrem, and 43 km (27 mi) south-east of the regional capital Poznań.