Japanese Submarine I-177 was a Japanese KD7 type Kaidai-class submarine that saw service during World War II in the Imperial Japanese Navy. I-177 was commissioned on 28 December 1942 and was sunk by USS Samuel S. Miles (DE-183) on 3 October 1944 with the loss of her entire crew of 101 sailors. She was the submarine responsible for sinking Australian Hospital Ship Centaur, an act considered to be a war crime, off the Australian east coast on 14 May 1943.