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