Winterswijk is a municipality and a town in the eastern Netherlands. It has a population of 29,022 and is situated in the Achterhoek, which lies in the easternmost part of the province of Gelderland in the Netherlands.

The Achterhoek is a cultural region in the Eastern Netherlands. Its name is geographically appropriate because the area lies in the easternmost part of the province of Gelderland and therefore in the east of the Netherlands, protruding into Germany. The Achterhoek lies at the east of the IJssel and Oude IJssel rivers. On the other sides, it borders Germany to the southeast and the province of Overijssel to the northeast.