The Swimming competition of the 10th FINA World Aquatics Championships consisted of 40 long course (50m) events, swum July 20–27, 2003 in Barcelona, Spain.
[1][2] Swimming's 40 events were split evenly between males and females (20 each) and were: Legend: WR – World Record; CR – Championship Record Legend: WR – World Record; CR – Championship Record * Host nation (Spain)