Zieleń [ˈʑɛlɛɲ] is a village in the administrative district of Gmina Trzemeszno, within Gniezno County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 3 kilometres (2 mi) south-east of Trzemeszno, 18 km (11 mi) east of Gniezno, and 66 km (41 mi) east of the regional capital Poznań.