23 golds
Most Olympic gold medals (all sports)
Phelps won 23 Olympic titles across four Games, nearly tripling the next-best swimmer and standing as the all-time record across every Olympic sport.
Swimming records divide into two kinds: career achievement records, led overwhelmingly by Michael Phelps, and event world records, many of which carry an asterisk from the 2009 polyurethane-suit era. Because those suits produced dozens of marks in a single season, a handful of 2009 records, like the men's 400m freestyle, proved almost impossible to break for over a decade, distorting the record book.
The marks below mix the sport's headline career records with current long-course (50m pool) world records across strokes and distances, as of the 2024-25 season. Times are ratified by World Aquatics and set in certified pools under anti-doping controls; short-course (25m) records are tracked separately and are generally faster because of the extra turns.
Records
8 golds
Most gold medals at one Olympics
At Beijing 2008 Phelps won eight gold medals in eight events, surpassing Mark Spitz's seven from 1972 and setting seven world records along the way.
26 golds
Most world championship gold medals
Across long-course World Championships Phelps collected 26 individual and relay golds, the most of any swimmer in the meet's history.
46.40s
Men's 100m freestyle world record
China's Pan Zhanle demolished the event at the Paris Olympics, winning by a bodylength and erasing the last of the sprint marks tainted by the suit era.
20.91s
Men's 50m freestyle world record
Set during the polyurethane-suit season in Sao Paulo, Cielo's mark is one of the longest-standing men's world records, untouched for over 15 years.
56.88s
Men's 100m breaststroke world record
Peaty is the only man ever under 57 seconds, set at the Gwangju World Championships; the record sits far ahead of the rest of history.
49.45s
Men's 100m butterfly world record
Dressel broke the barrier at the Tokyo Olympics, the fastest 100m butterfly ever swum and a benchmark of the modern textile-suit sprint era.
14:31.02
Men's 1500m freestyle world record
Set at the London Olympics, Sun Yang's distance mark has stood since, one of the most enduring men's records in the pool.
1:51.92
Men's 200m backstroke world record
Peirsol's mark, from the 2009 Rome World Championships, remains the standard in the event and among the toughest backstroke records to approach.
8:04.79
Women's 800m freestyle world record
Ledecky set the record at the Rio Olympics, winning by more than 11 seconds; she has since won the event at four straight Games.
3:55.38
Women's 400m freestyle world record
Australia's Titmus lowered the mark amid a fierce three-way rivalry with Ledecky and Summer McIntosh, defining women's middle-distance racing this decade.
55.48s
Women's 100m butterfly world record
Set at the Rio Olympics, Sjostrom's mark has stood for nearly a decade and anchored her case as the greatest butterfly sprinter in history.
4:26.36
Women's 400m individual medley world record
The 'Iron Lady' set the mark at the Rio Olympics, showcasing complete mastery of all four strokes across the longest medley.
2:06.12
Women's 200m individual medley world record
Set at the Kazan World Championships, Hosszu's 200m IM record underlines her dominance of medley racing throughout the 2010s.
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