'Grimm' (i) was a U-boat wolfpack operation in the area bounded by Norway, Iceland and Spitsbergen (31 May/6 June 1944).

The wolfpack comprised U-307, U-313, U-315, U-347, U-362, U-387, U-668, U-711, U-742 and U-997, and neither lost any of its own number nor sank any ship.