Sędeń Duży
 Sędeń Duży [ˈsɛndɛɲ ˈduʐɨ] is a village in the administrative district of Gmina Łąck within Płock County Masovian Voivodeship in east-central Poland. It lies approximately 5 kilometres (3 mi) north-west of Łąck 11 km (7 mi) south-west of Płock and 103 km (64 mi) west of Warsaw.The village has a population of 320.