Łężek [ˈwɛ̃ʐɛk] is a village in the administrative district of Gmina Książ Wielkopolski, within Śrem County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 8 kilometres (5 mi) west of Książ Wielkopolski, 8 km (5 mi) east of Śrem, and 39 km (24 mi) south-east of the regional capital Poznań.