Vietnamese-born Nhat Nguyen was selected to compete in the men's singles based on the BWF World Race to Tokyo Rankings.

Ireland qualified one canoeist for the men's C-1 class by finishing in the top eleven at the 2019 ICF Canoe Slalom World Championships in La Seu d'Urgell, Spain.

[9] Ireland entered two divers into the Olympic competition after finishing in the top 12 each of the men's springboard and women's platform, respectively, at the 2021 FINA Diving World Cup in Tokyo, Japan.

[11][12] A team of jumping riders was added to the Irish equestrian squad by winning the gold medal at the FEI Nations Cup Final in Barcelona, Spain.

Rhys McClenaghan secured one of the two spots available for individual based gymnasts, neither part of the team nor qualified through the all-around, at the 2019 World Championships in Stuttgart, Germany.

[22] Two-time Olympian Natalya Coyle secured her selection in the women's event with an eighth-place finish and fourth among those eligible for Olympic qualification at the 2019 European Championships in Bath, England.

[32] Head coach: Anthony Eddy Irish sailors qualified one boat in each of the following classes through the class-associated World Championships, and the continental regattas.

[34] On 11 June 2020, the Irish Sailing Association decided to forgo the domestic selection trials for the women's Laser Radial class because of the worldwide pandemic.

Instead, Rio 2016 silver medalist Annalise Murphy was officially nominated to the Irish roster for her third straight Games, after finishing twelfth, as the country's top-ranked sailor, at the class-associated Worlds in Melbourne, Australia four months earlier.

As the next highest-ranked eligible taekwondo practitioner, 2019 European silver medalist Jack Woolley thereby secured Ireland's first ever Olympic quota place, in the men's flyweight category (58 kg).