| Men's 400 metre freestyle at the 2005 FINA World Championships |
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| Date | 24 July 2005 | |||||||||
| Competitors | 57 | |||||||||
| Winning time | 3:42.91 | |||||||||
| Medalists | ||||||||||
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The men's 400 metre freestyle at the 2005 World Aquatics Championships took place on 24 July (heats and final) in the Olympic pool at Parc Jean-Drapeau in Montreal, Canada. 57 swimmers were entered and in the event in the preliminary heats, the top-8 of which advanced on to swim again in the final heat that event.
The existing records at the start of the event were: