Moresby Island is a large island that forms part of the Haida Gwaii archipelago (formerly known as Queen Charlotte Islands) in British Columbia, Canada, located at . Gwaii Haanas National Park Reserve and Haida Heritage Site includes Moresby and other islands. The island, together with its numerous nearby smaller islands and islets in the southern portion of the archipelago, is defined by Statistics Canada as Skeena-Queen Charlotte E, with a population of 402 as of the 2006 census. Almost all of its population resided in the unincorporated community of Sandspit, on the northeast corner of Moresby. The total land area of the electoral area is .