The Wurm (German pronunciation: [vʊʁm]; Dutch: Worm [ˈʋɔr(ə)m]) is a river in the state of North Rhine-Westphalia in western Germany.

It rises in the Eifel mountains and flows for 57 kilometres before discharging into the Rur.

The Wurm is a left (western) tributary of the Rur (Dutch: Roer).

North of Aachen (between Kerkrade and Herzogenrath) the river forms the border with the Netherlands for approximately 10 km.

The name Wurm is thought to originate from the German word warm (same meaning in English), as the source brooks were fed from the thermal springs in Aachen.