The swimming competitions at the 2000 Summer Olympics in Sydney took place from 16 to 23 September 2000 at the Sydney International Aquatic Centre in Homebush Bay. It featured 32 events, and a total of 954 swimmers from 150 nations.

The swimming competition at the 1996 Summer Olympics was held at the Georgia Tech Aquatic Center in Atlanta, United States. There were 762 competitors from 117 countries. This was the last Olympics where swimming B-finals were held.