Hinchinbrook Island is an island in the Gulf of Alaska lying at the entrance to Prince William Sound in the state of Alaska, USA. The island has a land area of 171.98 sq mi (445.438 km²), making it the 37th largest island in the United States. There was a population of five permanent residents as of the 2000 census.
Cape Hinchinbrook Light is located on the southwest side of the island.