Cook Island may refer to:
- Cook Island of Kiritimati, Kiribati
- Cook Island (New South Wales), an island
- Cook Island Aquatic Reserve, a marine protected area in New South Wales
- Cook Island Nature Reserve, a protected area in New South Wales
- Cook Island, South Sandwich Islands, central island in Southern Thule
- "Cook Island" is the adjectival demonym for people and things from the Cook Islands
See also
- Cook Islands, self-governing democracy in the Pacific in free association with New Zealand
- Cook (disambiguation)
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