Milbanke Sound is a sound on the coast of the Canadian province of British Columbia, extending east from Queen Charlotte Sound, with Price Island on the west, Swindle Island on the north, and the Bardswell Group of islands on the south. Milbanke Sound is one of the open sea portions of the Inside Passage, with Seaforth Channel joining from the east and Finlayson Channel from the north. Mathieson Channel also connects to Milbanke Sound from the north, and leads to Fiordland Recreation Area.