Cockatoo Island is a UNESCO World Heritage Site in Sydney Harbour, New South Wales, Australia.
Cockatoo Island may also refer to:
- Cockatoo Island Dockyard, an important naval and commercial dockyard in Sydney Harbour
- Cockatoo Island (Queensland) in the Brisbane River
- Cockatoo Island (Western Australia), an island in the Buccaneer Archipelago off the coast of Western Australia
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