[9] Belgium entered one canoeist to compete in the men's K-1 class at the Games, as the International Canoe Federation accepted the nation's request to claim an unused berth from the 2020 Oceania Championships.

[10] Belgium qualified a boat in the women's K-2 200 m for the Games by finishing fourth overall and second among those nations eligible for Olympic qualification at the 2019 ICF Canoe Sprint World Championships in Szeged, Hungary.

[11] Meanwhile, one additional boat was awarded to the Belgian canoeist in the men's K-1 1000 m by winning the gold medal at the 2021 European Canoe Sprint Qualification Regatta.

Belgium fielded a squad of three equestrian riders into the Olympic team jumping competition by winning the gold medal and securing the first of three available berths for Group A and B at the European Championships in Rotterdam, Netherlands.

[17][19] Key: Belgium men's field hockey team qualified for the Olympics by winning the gold medal at the 2019 EuroHockey Nations Championships in Antwerp.

Belgium qualified one boat in the men's lightweight double sculls for the Games by winning the B-final and securing the last of seven berths available at the 2019 FISA World Championships in Ottensheim, Austria.

Rio 2016 Olympian Jaouad Achab qualified directly for the men's lightweight category (68 kg) by finishing among the top five taekwondo practitioners at the end of the WT Olympic Rankings.

Belgium qualified four triathletes for the following events at the Games by winning the gold medal and securing the first of three available berths at the 2021 ITU Mixed Relay Olympic Qualification Tournament in Lisbon, Portugal.