Ćwierdzin [ˈt͡ɕfjɛrd͡ʑin] is a village in the administrative district of Gmina Witkowo, within Gniezno County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 6 kilometres (4 mi) north-east of Witkowo, 16 km (10 mi) east of Gniezno, and 62 km (39 mi) east of the regional capital Poznań.