Masset Inlet is a large saltwater bay located in the heart of the lowland of northern Graham Island, the northernmost and largest island of the Haida Gwaii islands on the North Coast of British Columbia, Canada. It is fed by several rivers, the largest of which is the Yakoun River, and is connected to the open sea of the Dixon Entrance by the narrow Masset Sound and Masset Harbour, which opens onto McIntyre Bay.