Jadwisin [jadˈviɕin] is a village in the administrative district of Gmina Serock, within Legionowo County, Masovian Voivodeship, in east-central Poland. It lies approximately 5 kilometres (3 mi) south-west of Serock, 13 km (8 mi) north-east of Legionowo, and 30 km (19 mi) north of Warsaw.