Jelnia [ˈjɛlɲa] is a village in the administrative district of Gmina Drzewica, within Opoczno County, Łódź Voivodeship, in central Poland. It lies approximately 3 kilometres (2 mi) south-west of Drzewica, 13 km (8 mi) north-east of Opoczno, and 79 km (49 mi) south-east of the regional capital Łódź.