'Nebelkönig' was a U-boat wolfpack operation in the Norwegian Sea and Arctic Ocean between Greenland and occupied Norway (27 July/14 August 1942).

The wolfpack comprised U-255, U-355, U-403, U-405, U-435, U-586, U-589, U-591, U-592 and U-657, and neither lost any of its own number nor sank any ship.