'Tümmler' (i) was a U-boat wolfpack operation in the Bay of Biscay, eastern part of the central Atlantic and western part of the Mediterranean as it transited from bases in German-occupied western France into the Mediterranean Sea (1/11 October 1942).

The wolfpack comprised U-89, U-438, U-458, U-593, U-605 and U-660, and neither lost any of its own number nor sank any Allied ship.