The 2021 Australian Swimming Championships were held from 14 to 18 April 2021 at the Gold Coast Aquatic Centre in Gold Coast, Queensland. Following Australia's performance at the 2016 Rio Olympics where 29 medals were won and finishing 10th on the medal tally, Swimming Australia announced in the February 2017 that the timing of the selection trials would be modified. Historically, the trails were held in April several months before the Olympics were held. This will be now changed to follow the American model where the trails are held six weeks before. The 2021 Australian Swimming Trials were then held at the South Australia Aquatic and Leisure Centre from 12 to 17 June and will be selection trials for the 2020 Summer Olympics in Tokyo.