Quadra Island is a large island off the eastern coast of Vancouver Island, in British Columbia, Canada. It is part of the Discovery Islands, in the Strathcona Regional District.

Juan Francisco de la Bodega y Quadra was a Spanish Criollo naval officer operating in the Americas. Assigned to the Pacific coast Spanish Naval Department base at San Blas, in Viceroyalty of New Spain, he explored the Northwest Coast of North America as far north as present day Alaska. Bodega Bay in California is named for him.