Kiełczyn [ˈkʲɛu̯t͡ʂɨn] is a village in the administrative district of Gmina Książ Wielkopolski, within Śrem County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 3 kilometres (2 mi) south-west of Książ Wielkopolski, 15 km (9 mi) east of Śrem, and 44 km (27 mi) south-east of the regional capital Poznań.