Duivelsberg (German: Wylerberg or Teufelsberg, which literally translates to 'the devil's mountain') is a hill and nature reserve in the municipality of Berg en Dal in the Dutch province of Gelderland, near the border with Germany (North Rhine-Westphalia).

The 75.9-metre (249 ft) hill is located on a moraine east of Nijmegen, between Berg en Dal, Beek and the Dutch-German border.

[1] Over the centuries the hill has been militarily significant, this historical background in more recent times having given rise to issues of sovereignty between Germany and The Netherlands.

In September 1944 airborne troops of the U.S. 508th Parachute Infantry Regiment[2] fought to capture the Duivelsberg, "Hill 75.9",[3] during Operation Market Garden.

With the notable support of Dutch politician Frits Bakker Schut, Duivelsberg was one of the many small areas the Netherlands annexed from Germany on 23 April 1949.