Antigua and Barbuda at the 2020 Summer Olympics

Antigua and Barbuda 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 eleventh appearance at the Summer Olympics.

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

Athletics
Athletes from Antigua and Barbuda achieved the entry standards, either by qualifying time or by world ranking, in the following track and field events (up to a maximum of 3 athletes in each event):


 * 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

Boxing
Antigua and Barbuda qualified one boxer for the first time since 1988. With the cancellation of the 2021 Pan American Qualification Tournament in Buenos Aires, Argentina, Alston Ryan finished fifth in the men's featherweight division to secure a place on the Antiguan team based on the IOC's Boxing Task Force Rankings for the Americas.

Sailing
Antigua and Barbuda received an invitation from the Tripartite Commission to compete in the Laser Radial class, marking the country's recurrence to the sport for the first time in two decades.

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

Swimming
Antigua and Barbuda 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.