2009 World Championships in Athletics – Men's decathlon

The men's decathlon at the 2009 World Championships in Athletics was held at the Olympic Stadium on August 19 and August 20. The competition is notable for having the highest number of competitors (38) and the highest fraction of athletes (almost 90%) finishing the competition in the World Championships history.

Records
Prior to the competition, the following records were as follows.

Final standings
Key: PB = Personal best, SB = Seasonal best, WL = World leading (in a given season)