Rosemary Island is an island in the Dampier Archipelago in the Pilbara region of Western Australia. With Enderby Island it forms Class A Nature Reserve 36915, part of a proposed national park. During World War II an airstrip was established at the north end of the island, where there is also a vehicle track and a well with a distinctive date palm. The well was constructed of concrete with a corrugated steel liner and is now filled with 20th century debris.