Cook Island

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