Cook Islands, represented by eight athletes, competed at the 2012 Summer Olympics in London from 27 July to 12 August 2012. This was the nation's seventh appearance at the Olympics.

Cook Islands Sports and National Olympic Committee sent the nation's largest delegation to these Olympic games. A total of 8 athletes, 3 men and 5 women, had competed in 5 different sporting events; half of them had been given Universality places by the International Olympic Committee. For the first time in its history, Cook Islands was represented by more female than male athletes at an Olympic event. Slalom and sprint canoeing was the nation's only sport to debut at these Olympic games. Laser Radial sailor Helema Williams was the nation's flag bearer at the opening ceremony. Cook Islands, however, has yet to win an Olympic medal.

The Cook Islands have qualified boats for the following events.

Cook Islands has qualified 1 boat for each of the following events

M = Medal race; EL = Eliminated – did not advance into the medal race;

The Cook Islands has gained two "Universality places" from the FINA.

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