SM U-61

SM U-61 was a German Type U 57 U-boat commissioned and deployed to operate off the coast of the British Isles and attack coastal shipping as part of the U-boat Campaign during World War I.

In a 15-month career spanning nine war patrols, the U-61 plagued allied shipping in the Atlantic Ocean during the German war on Allied trade (Handelskrieg). She sank 33 Allied ships, totalling 84564 t. She also damaged seven ships of 23783 t and the destroyer USS Cassin (DD-43) before fleeing the fight. She was sunk on 26 March 1918 by the submarine chaser USS PC-51 in the Atlantic with all 36 hands.