Rybnik [ˈrɨbnik] is a village in the administrative district of Gmina Brzeźnio, within Sieradz County, Łódź Voivodeship, in central Poland. It lies approximately 4 kilometres (2 mi) south-west of Brzeźnio, 19 km (12 mi) south-west of Sieradz, and 71 km (44 mi) south-west of the regional capital Łódź.