Zielęcin [ʑɛˈlɛnt͡ɕin] is a village in the administrative district of Gmina Rząśnia, within Pajęczno County, Łódź Voivodeship, in central Poland. It lies approximately 5 kilometres (3 mi) east of Rząśnia, 11 km (7 mi) north-east of Pajęczno, and 68 km (42 mi) south of the regional capital Łódź.

The village has an approximate population of 500.