Mercy Bay is a remote and dramatic saltwater inlet on the north shore of Banks Island, within the boundaries of Aulavik National Park in Canada's Northwest Territories. It is a significant feature of the Inuvialuit Settlement Region, cutting approximately 15 kilometers inland from the coast of the Arctic Ocean. The bay is flanked by steep canyons to the southeast and is part of a coastal zone that includes neighboring Castel Bay. This is an exceptionally isolated Arctic environment, accessible only by charter aircraft or extended expedition, and is steeped in both natural and cultural history, including the historic site of HMS Investigator's overwintering.