The swimming events at the 2023 World Aquatics Championships were held from 23 to 30 July 2023 at the Marine Messe Fukuoka Hall A in Fukuoka, Japan. Léon Marchand of France won the Male Swimmer of the Championships award and Kaylee McKeown of Australia won the Female Swimmer of Championships award based on individual point score. The United States won the Team of the Championships award based on team point score. World Records were broken in six individual and three relay events. China's Qin Haiyang and Australia's Kaylee McKeown became the first male and female athletes at a World Aquatics Championships to win the 50 m, 100 m & 200 m events in a single stroke, at a single World Aquatics Championships.
42 events were held.
All times are local (UTC+9).
<span style="font-size:95%"> Swimmers who participated in the heats only and received medals.</span>
<span style="font-size:95%"> Swimmers who participated in the heats only and received medals.</span>
The following world and championship records were set during the competition.