Dzierzążnia [d͡ʑɛˈʐɔ̃ʐɲa] is a village in Płońsk County, Masovian Voivodeship, in east-central Poland. It is the seat of the gmina (administrative district) called Gmina Dzierzążnia. It lies approximately 11 kilometres (7 mi) west of Płońsk and 70 km (43 mi) north-west of Warsaw.