[1] It was the nation's eighteenth appearance at the Summer Olympics, although it previously competed in four other editions as a British colony, and as part of the West Indies Federation.

With the cancellation of the 2021 Pan American Qualification Tournament in Buenos Aires, Argentina, Aaron Prince finished fourth in the men's middleweight division to secure a place on the Trinidad and Tobago team based on the IOC's Boxing Task Force Rankings.

Gabriella Wood accepted a continental berth from the Americas as the nation's top-ranked judoka outside of direct qualifying position in the IJF World Ranking List of June 28, 2021.

[7] Trinidad and Tobago qualified one boat in the women's single sculls for the Games by winning the bronze medal and securing the third of five berths available at the 2021 FISA Americas Olympic Qualification Regatta in Rio de Janeiro, Brazil.

[9] M = Medal race; EL = Eliminated – did not advance into the medal race Swimmers from Trinidad and Tobago further achieved qualifying standards in the following events (up to a maximum of 2 swimmers in each event at the Olympic Qualifying Time (OQT), and potentially 1 at the Olympic Selection Time (OST)):[10][11]