Cook Islands at the 2020 Summer Olympics

Cook Islands competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. It was the nation's ninth consecutive appearance at the Summer Olympics.

Competitors
The following is the list of number of competitors in the Games.

Athletics
Cook Islands has received universality slots from IAAF to send a male track and field athlete to the Olympics.


 * Key
 * Note–Ranks given for track events are within the athlete's heat only
 * Q = Qualified for the next round
 * q = Qualified for the next round as a fastest loser or, in field events, by position without achieving the qualifying target
 * NR = National record
 * N/A = Round not applicable for the event
 * Bye = Athlete not required to compete in round


 * Track & road events

Slalom
Cook Islands qualified one canoeist in the women's K-1 class by finishing as the 16th ranked eligible NOC at the 2019 ICF Canoe Slalom World Championships in La Seu d'Urgell, Spain.

Sprint
Canoeists from the Cook Islands qualified two boats in each of the following distances for the Games through the 2020 Oceania Championships in Penrith, New South Wales.

Qualification Legend: FA = Qualify to final A (medal); FB = Qualify to final B (non-medal)

Swimming
Cook Islands qualified two swimmers in three events.