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.
Lisbeth Constance Trickett, is an Australian retired competitive swimmer. She was a gold medallist at the 2004 Summer Olympics, the 2008 Summer Olympics, and the 2012 Summer Olympics. She was the world record holder in the short-course (25m) 100-metre freestyle.
Stephanie Louise Rice, OAM is an Australian former competitive swimmer. She won three gold medals at the 2008 Summer Olympics in Beijing, and was awarded the Medal of the Order of Australia on 26 January 2009.
The men's 4 × 100 metre freestyle relay event at the 2000 Summer Olympics took place on 16 September at the Sydney International Aquatic Centre in Sydney, Australia.
The men's 100 metre freestyle event at the 2000 Summer Olympics took place on 19–20 September at the Sydney International Aquatic Centre in Sydney, Australia. There were 73 competitors from 66 nations. Nations have been limited to two swimmers each since the 1984 Games.
The men's 400 metre freestyle event at the 2000 Summer Olympics took place on 16 September at the Sydney International Aquatic Centre in Sydney, Australia.
The men's 100 metre butterfly event at the 2000 Summer Olympics took place on 21–22 September at the Sydney International Aquatic Centre in Sydney, Australia.
The men's 200 metre individual medley event at the 2000 Summer Olympics took place on 20–21 September at the Sydney International Aquatic Centre in Sydney, Australia.
The women's 200 metre individual medley event at the 2000 Summer Olympics took place on 18–19 September at the Sydney International Aquatic Centre in Sydney, Australia.
The women's 4 × 100 metre medley relay event at the 2000 Summer Olympics took place on 22–23 September at the Sydney International Aquatic Centre in Sydney, Australia.
Nathan Ghar-jun Adrian is an American competitive swimmer and five-time Olympic gold medalist who formerly held the American record in the long course 50-meter freestyle event.
Kenneth King-him To was a Hong Kong Australian swimmer who practised individual medley, freestyle, butterfly and breaststroke. He won 6 medals at the 2010 Summer Youth Olympics, was the male overall winner of the 2012 FINA Swimming World Cup and was a World Championships silver medallist. He was the holder of 16 Hong Kong national swimming records.
James Magnussen is a retired Australian swimmer and Olympic medallist. He was the 2011 and 2013 100-metre freestyle world champion, and holds the record for the fifth fastest swim in history in the 100-metre freestyle, with a time of 47.10, which until 2016 also stood as the fastest swim in textile swimwear material.
Nicolas Fink is an American competitive swimmer. He is a five-time world champion in breaststroke events and a 2024 Olympic Silver Medalist in the 100 meter breaststroke. He is a world record holder in the short course 4×100 meter medley relay and 4×50 meter mixed medley relay. He is the Americas record holder in the short course 50 meter breaststroke, 100 meter breaststroke, and 200 meter breaststroke as well as the American record holder in the long course 50 meter breaststroke. In the 50 meter breaststroke, he won the World Short Course titles in 2021 and 2022 and World Long Course title in 2022. In the 100 meter breaststroke, he is the 2022 World Short Course gold medalist. In the 200 meter breaststroke, he is the 2021 World Short Course gold medalist.
Emma Jennifer McKeon, is an Australian competitive swimmer. She is an eight-time world record holder, three current and five former, in relays. Her total career haul of 12 Olympic medals following the 2024 Olympic Games made her Australia's most decorated Olympian and included one gold medal from the 2016 Summer Olympics in Rio de Janeiro, four gold medals from the 2020 Summer Olympics in Tokyo and one gold medal from the 2024 Summer Olympics in Paris. With four gold and three bronze medals she was the most decorated athlete across all sports at the 2020 Summer Olympics, and tied for the most medals won by a woman in a single Olympic Games. She has also won 20 medals, including five gold medals, at the World Aquatics Championships; and a record 20 medals, including 14 gold, at the Commonwealth Games.
Caeleb Remel Dressel is an American competitive swimmer who specializes in freestyle, butterfly, and individual medley events. He swims representing the Cali Condors as part of the International Swimming League. He won a record seven gold medals at the 2017 World Aquatics Championships in Budapest, nine medals, six of which were gold, at the 2018 World Swimming Championships in Hangzhou, and eight medals, including six gold, at the 2019 World Aquatics Championships in Gwangju. Dressel is an eight-time Olympic gold medalist and holds world records in the 100 meter butterfly, 50 meter freestyle, and 100 meter individual medley.
Kyle Chalmers, is an Australian competitive swimmer. He is a world record holder in the short course 100 metre freestyle, 4×100 metre medley relay, and long course 4×100 metre mixed freestyle relay. He is the Oceanian and Australian record holder in the short course 50 metre butterfly and 50 metre freestyle.
Matthew Temple is an Australian swimmer. He is the Oceanian record and Australian record holder in the long course 100 metre butterfly with a time of 50.25 seconds. He competed in the men's 200 metre butterfly at the 2019 World Aquatics Championships, placing 10th in his semi final. At the 2020 Summer Olympics, he placed fifth in the 100 metre butterfly with a time of 50.92 seconds in the final.
Joseph Hunter Armstrong is an American competitive swimmer. He is the world record holder in the long course 50 meter backstroke. At the 2022 World Aquatics Championships, he won a silver medal in the 50 meter backstroke, a bronze medal in the 100 meter backstroke, gold medals in the 4×100 meter freestyle relay and 4×100 meter mixed medley relay, and a silver medal in the 4×100 meter medley relay. At the 2020 Summer Olympics, he won a gold medal in the 4×100 meter medley relay, swimming backstroke in the preliminaries, and placed ninth in the 100 meter backstroke.
Trenton Jeffrey Julian is an American competitive swimmer. He is a world record holder in the short course 4×200 meter freestyle relay and 4×100 meter medley relay. He won a gold medal in the 4×200 meter freestyle relay at the 2019 World University Games. He followed up with gold medals in the 4×200 meter freestyle relay at the 2021 World Short Course Championships, 2022 World Aquatic Championships, and 2022 World Short Course Championships. In the 4×100 meter medley relay, he won a world title and gold medal at the 2022 World Short Course Championships, swimming butterfly on each the prelims and finals relay.
