Swimming at the 2008 Summer Olympics

The swimming competitions at the 2008 Summer Olympics took place from 9 to 17 August 2008 at the Beijing National Aquatics Centre. The newly introduced open water marathon events (10 km) were held on 20 and 21 August 2008 at Shunyi Olympic Rowing-Canoeing Park.

Swimming featured 34 events (17 male, 17 female), including two 10 km open-water marathons. The remaining 32 were contested in a 50 m long course pool within the Olympic Park.

The United States claimed a total of 31 medals (12 golds, 9 silver, and 10 bronze) in the leaderboard to maintain its standings as the most successful nation in swimming. A stellar performance in the pool also made an Olympic history for Michael Phelps, who captured eight gold medals to break Mark Spitz's 1972 record, a total of seven, at a single Games. Despite the male swimmers failing to attain a single gold in swimming, Australia managed to repeat a second-place effort on its third consecutive Olympics with 20 medals (six golds, six silver, and eight bronze). Meanwhile, Great Britain finished third with a total of six medals by the benefit of a sterling long-distance freestyle double from Rebecca Adlington.

A total of 25 world records and 65 Olympic records were set during the competition.