Schlinge is a river of North Rhine-Westphalia, Germany, and Gelderland, Netherlands. Dutch names are Boven-Slinge and Bielheimerbeek. Its source is between Gescher and Stadtlohn. It flows generally west through Südlohn, Winterswijk, Bredevoort, Aalten and Varsseveld. It flows into the Oude IJssel between Gaanderen and Doetinchem.