Swimming at the 2009 World Aquatics Championships – Men's 100 metre freestyle

The men's 100 m freestyle at the 2009 World Championships took place on 29 July (heats and semifinals) and the evening of 30 July (finals) at the Foro Italico in Rome, Italy. Existing records at the start of the 2009 Championships were: * World record (WR): 47.05, Eamon Sullivan (Australia), 13 August 2008, Beijing, China * Championship record (CR): 48.12, Filippo Magnini (Italy), 28 July 2005, Montreal, Canada Note: During the 4×100 m freestyle relay on Sunday, 26 July 2009, the CR in the 100 m freestyle was bettered 4 times by the following lead-off legs:

Swimming at the 2009 World Aquatics Championships – Men's 100 metre freestyle

The men's 100 m freestyle at the 2009 World Championships took place on 29 July (heats and semifinals) and the evening of 30 July (finals) at the Foro Italico in Rome, Italy. Existing records at the start of the 2009 Championships were: * World record (WR): 47.05, Eamon Sullivan (Australia), 13 August 2008, Beijing, China * Championship record (CR): 48.12, Filippo Magnini (Italy), 28 July 2005, Montreal, Canada Note: During the 4×100 m freestyle relay on Sunday, 26 July 2009, the CR in the 100 m freestyle was bettered 4 times by the following lead-off legs: