Vancouver Island is an island in the northeastern Pacific Ocean and part of the Canadian province of British Columbia. The island is 456 km (283 mi) in length, 100 km (62 mi) in width at its widest point, and 32,100 km² (12,400 sq mi) in total area, while 31,285 km² (12,079 sq mi) are of land. The island is the largest by area and the most populous^{[citation needed]} along the west coasts of the Americas.

The southern part of Vancouver Island and some of the nearby Gulf Islands are the only parts of British Columbia or Western Canada to lie south of the 49th parallel. The southeast part of the island has one of the warmest climates in Canada, and since the mid-1990s has been mild enough in a few areas to grow Mediterranean crops such as olives and lemons.

The population of Vancouver Island was 864,864 as of 2021. Nearly half of that population (~400,000) live in the metropolitan area of Greater Victoria on the southern tip of the island, which includes Victoria, the capital of British Columbia. Other notable cities and towns on Vancouver Island include Nanaimo, Campbell River, Courtenay, Port Alberni and Parksville, all on or near the east coast.

Indigenous peoples have inhabited Vancouver Island for thousands of years, long before the arrival of Spanish and British naval expeditions in the late 18th century. The Spanish and British conjointly named it Quadra's and Vancouver's Island in commemoration of the friendly negotiations held in 1792 between the Spanish commander of Fort San Miguel in Nootka Sound, Juan Francisco de la Bodega y Quadra, and British naval captain George Vancouver, during the Nootka Crisis. (Bodega y Quadra's name was eventually dropped.) It is one of several North American locations named after George Vancouver, who between 1791 and 1794 explored the Pacific Northwest.

Vancouver Island is the world's 43rd largest island, Canada's 11th largest island, and Canada's second most populous island after the Island of Montreal.

Vancouver Island has been the homeland of many indigenous peoples for thousands of years. The groupings, by language, are the Kwakwakaʼwakw (also known as the Kwakiutl), Nuu-chah-nulth, and various Coast Salish peoples. While there is some overlap, Kwakwakaʼwakw territory includes northern and northwestern Vancouver Island and adjoining areas of the mainland, the Nuu-chah-nulth span most of the west coast, while the Coast Salish cover the southeastern Island and southernmost extremities along the Strait of Juan de Fuca. Their cultures are connected to the natural resources abundant in the area.

The Kwakwakaʼwakw today number about 5,500, who live in British Columbia on northern Vancouver Island and the mainland. They are also known as Kwakiutl in English, from one of their tribes, but they prefer their autonym Kwakwakaʼwakw. Their indigenous language, part of the Wakashan family, is Kwakʼwala. The name Kwakwakaʼwakw means "speakers of Kwakʼwala". The language is now spoken by less than 5% of the population—about 250 people. Today, 17 separate tribes make up the Kwakwakaʼwakw. Some Kwakwakaʼwakw groups are now extinct. Kwakʼwala is a Northern Wakashan language, a grouping shared with Haisla, Heiltsuk and Wuikyala. Kwakwakaʼwakw centres of population on Vancouver Island include communities such as Fort Rupert, Alert Bay and Quatsino, the Kwakwakaʼwakw tradition of the potlatch was banned by the federal government of Canada in 1885, but has been revived in recent decades.

The Nuu-chah-nulth (pronounced [nuːʧanˀuɬ]), are indigenous peoples in Canada. Their traditional home is on the west coast of Vancouver Island. In pre-contact and early post-contact times, the number of nations was much greater, but as in the rest of the region, smallpox and other consequences of contact resulted in the disappearance of some groups and the absorption of others into neighbouring groups.