Antosin [anˈtɔɕin] is a village in the administrative district of Gmina Rybno, within Sochaczew County, Masovian Voivodeship, in east-central Poland. It lies approximately 5 kilometres (3 mi) north of Rybno, 12 km (7 mi) north-west of Sochaczew, and 63 km (39 mi) west of Warsaw.