Karczew ([ˈkart͡ʂɛf]; Yiddish: קארטשעוו Kartshev) is a town in Otwock County, Masovian Voivodeship, Poland, the seat of the urban-rural administrational district of Gmina Karczew, with 10,271 inhabitants (2010). Karczew is a part of the Warsaw Agglomeration. It is situated on the right bank of Vistula River.