Dunk Island is an island within the Cassowary Coast Region, Queensland, Australia. The island lies 4 km off the Australian east coast, opposite the town of Mission Beach. The island forms part of the Family Islands National Park and is in the larger Great Barrier Reef World Heritage Area.
The island is surrounded by reefs and has a diverse population of birds. Aborigines once used the island as a source of food. Europeans first settled on the island in 1897. Dunk Island was used by the Royal Australian Air Force during World War II. In recent years the island and its resort facilities were affected by both Cyclone Larry and Cyclone Yasi.