Unternehmen Donnerkeil was the codename for a German military operation of the Second World War. Donnerkeil was an air superiority operation in support of Operation Cerberus, also known as the Channel Dash by the Kriegsmarine.

The Channel Dash was a German naval operation during the Second World War. A Kriegsmarine squadron comprising the two Scharnhorst-class battleships, the heavy cruiser Prinz Eugen and their escorts was evacuated from Brest in Brittany to German ports. Scharnhorst and Gneisenau had arrived in Brest on 22 March 1941 after the success of Operation Berlin in the Atlantic. More raids were planned and the ships were refitted at Brest. The ships were a threat to Allied trans-Atlantic convoys and RAF Bomber Command attacked them from 30 March 1941. Gneisenau was hit on 6 April 1941 and Scharnhorst on 24 July 1941, after dispersal to La Pallice. In late 1941, Adolf Hitler ordered the Oberkommando der Marine to plan an operation to return the ships to German bases against a British invasion of Norway. The short route up the English Channel was preferred to a detour around the British Isles for surprise and air cover by the Luftwaffe and on 12 January 1942, Hitler gave orders for the operation.