Swimming at the 2003 World Aquatics Championships – Men's 100 metre breaststroke

Men's 100m Breastroke at the 2003 FINA World Aquatics Championships
Dates	20 July (prelims & semifinals) 21 July (final)
Winning time	59.78 seconds WR
Medalists
Kosuke Kitajima    Japan   Brendan Hansen    United States   James Gibson    Great Britain
← 2001 2005 →

The Men's 100 Breaststroke event at the 10th FINA World Aquatics Championships swam on 20–21 July 2003 in Barcelona, Spain. Preliminary and Semifinal heats swam on 20 July, with the Final on 21 July.

At the start of the event, the existing World (WR) and Championship (CR) records were both:

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