Marcelin [marˈt͡sɛlin] is a village in the administrative district of Gmina Rząśnia, within Pajęczno County, Łódź Voivodeship, in central Poland. It lies approximately 7 kilometres (4 mi) north of Rząśnia, 16 km (10 mi) north of Pajęczno, and 63 km (39 mi) south-west of the regional capital Łódź.