[11] Argentina qualified a single boat in the men's K-1 1000 m for the Games by finishing ninth overall and seventh among those nations eligible for Olympic qualification at the 2019 ICF Canoe Sprint World Championships in Szeged, Hungary.

Two-time Olympian María Belén Pérez Maurice claimed a spot in the women's sabre by winning the final match at the Pan American Zonal Qualifier in San José, Costa Rica.

[18] Key: Argentina men's field hockey team qualified for the Olympics by winning the gold medal and securing an outright berth at the final match of the 2019 Pan American Games in Lima.

Argentina women's field hockey team qualified for the Olympics by winning the gold medal and securing an outright berth at the final match of the 2019 Pan American Games in Lima.

399) received a spare berth declined by one of the top 60 original official entrants to compete in the women's event, as the next highest-ranked golfer vying for qualification based on the IGF World Rankings.

Seventeen-year-old Martina Dominici booked a spot in the women's individual all-around and apparatus events, by finishing seventh out of the twenty gymnasts eligible for qualification at the 2019 World Championships in Stuttgart, Germany.

[28][29] On 23 June 2021, Dominici was reportedly tested positive for a banned substance, while deliberately waiting for the results of her appeal to compete at the Olympics; otherwise, her spot would be allocated to Abigail Magistrati, the nation's next highest-ranked gymnast at the 2019 World Championships.

[30] Key: Argentina men's handball team qualified for the Olympics by winning the gold medal and securing an outright berth at the final match of the 2019 Pan American Games in Lima.

[36] Argentina qualified one boat in the women's lightweight double sculls for the Games by winning the gold medal and securing the first of three berths available at the 2021 FISA Americas Olympic Qualification Regatta in Rio de Janeiro, Brazil.

[42] Rio 2016 Olympian Federico Gil earned a direct place in the men's skeet for the rescheduled Games as the highest-ranked shooter vying for qualification in the ISSF World Olympic Rankings of 6 June 2021.

Leandro Usuna secured a spot previously allocated by the defending champion Lucca Mesinas, as the next highest-ranked surfer vying for qualification, following his silver-medal finish at the 2019 Pan American Games in Lima, Peru.

Horacio Cifuentes scored the first-stage final triumph for an automatic spot in the men's singles, with his teammate Gastón Alto joining him to hand one of the last three tickets available in the repechage round at the Latin American Qualification Tournament in Rosario.

[54] Argentina men's and women's beach volleyball teams qualified for the Olympics, by winning the gold medal each at the 2018–2020 CSV Continental Cup Final in Santiago, Chile and in Asuncion, Paraguay.

For the first time in 24 years, Argentina entered one wrestler to compete in the men's freestyle 65 kg into the Olympic competition, by progressing to the top two finals at the 2020 Pan American Qualification Tournament in Ottawa, Canada.