Tosie [ˈtɔɕɛ] is a village in the administrative district of Gmina Kosów Lacki, within Sokołów County, Masovian Voivodeship, in east-central Poland. It lies approximately 4 kilometres (2 mi) north of Kosów Lacki, 26 km (16 mi) north of Sokołów Podlaski, and 91 km (57 mi) north-east of Warsaw.