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.

Roman Andreyevich Sludnov is a breaststroke swimmer from Russia. He was the first person to swim the long course 100 m breaststroke under one minute. In 2000 he held world records in the long course 100 m and short course 100 m and 200 m. At the 2000 Olympics, he won a bronze medal in the 100 m event.