Swimming at the 2009 World Aquatics Championships – Men's 50 metre breaststroke

The heats for the men's 50 metre breaststroke race at the 2009 World Championships took place in the morning and evening of 28 July. The final took place in the evening session of 29 July at the Foro Italico in Rome, Italy.

Records
Prior to this competition, the existing world and competition records were as follows: The following records were established during the competition: