The swimming competitions at the 2019 Pan American Games in Lima were held from 6 to 10 August at the Aquatic Centre.

[1] Similar to the program's format in 2015, swimming features a total of 36 events (17 each for men and women and 2 mixed), including two 10 km open-water marathons.

As Host Country, Peru automatically will qualify 18 male and 18 female competitors in the pool.

[2] Each National Olympic Committee (NOC) may use proven swim times attained during the qualification period of those swimmers who have met the qualifying standards established by the UANA for the 2019 Pan American Games at a competition recognized by the FINA from the official list of approved qualifying competitions for the 18th FINA World Aquatics Championships held in Gwangju, Korea.

Countries not qualified can enter one male and one female swimmer through the universality rule.