The following is the list of number of competitors participating in the Games: Costa Rican athletes further 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):[2][3] Costa Rica entered one rider each to compete in the men's and women's Olympic road races, by virtue of his top 50 national finish (for men) and her top 100 individual finish (for women) in the UCI World Ranking.

[4] Costa Rica entered one BMX rider to compete in the men's freestyle, by finishing in the top two at the 2019 UCI Urban Cycling World Championships in Chengdu, China.

Luciana Alvarado scored a third-place finish to book the last of two available berths in the women's individual all-around and apparatus events at the 2021 Pan American Championships in Rio de Janeiro, Brazil.

Ian Sancho Chinchila 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][8] On July 23, Carlos Muñoz Herrera joined the nation's surfing squad at the Games after Portugal's Frederico Morais tested positive for COVID-19.