The swimming competitions at the 2016 Summer Olympics in Rio de Janeiro took place from 6 to 13 August at the Olympic Aquatics Stadium. The women's open-water marathon was held on August 15, and the men's open water race on August 16 in Fort Copacabana.

The Olympic Aquatics Stadium was a temporary aquatics center in the Barra Olympic Park in Rio de Janeiro. The venue hosted the swimming events, Synchronized swimming finals and water polo finals at the 2016 Summer Olympics, and the para-swimming events for the 2016 Summer Paralympics.