The Arnsberg Forest Nature Park (German: Naturpark Arnsberger Wald) is a nature park in the districts of Hochsauerlandkreis and Soest within the administrative region of Arnsberg in the German state of North Rhine-Westphalia. The park was established in 1960 and covers an area of 482 km2. Nearly 350 km2 of the protection is forested and the park's wooded hills rise up to 581.5 m above sea level (NN).
The nature park, which consists of the Arnsberg Forest in the west and the Warstein Forest in the east, is important for the regional economy both in terms of forestry and tourism. The two forests form a densely wooded part of the Süder Uplands within the Rhine Massif.