Tonga at the 2020 Summer Olympics

Tonga 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, due to the COVID-19 pandemic. It was the nation's tenth consecutive appearance at the Summer Olympics.

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

Athletics
Tonga received a universality slot from the World Athletics 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

Swimming
Tonga received a universality invitation from FINA to send two top-ranked swimmers (one per gender) in their respective individual events to the Olympics, based on the FINA Points System of June 28, 2021.

Taekwondo
Tonga entered two athletes into the taekwondo competition at the Games. Rio 2016 Olympian Pita Taufatofua (men's +80 kg) and Malia Paseka (women's 67 kg) secured spots with a victory each in their respective weight classes at the 2020 Oceania Qualification Tournament in Gold Coast, Queensland, Australia.

Weightlifting
Tonga received one tripartite invitation quota from the International Weightlifting Federation.