| 57 from 49 nations|
2 Aug 2013 – 3 Aug 2013
Palau Sant Jordi
| Palau Sant Jordi, Barcelona, Spain|
The men's 100 metre butterfly event in swimming at the 2013 World Aquatics Championships took place on 2–3 August at the Palau Sant Jordi in Barcelona, Spain.
Swimming at the 2013 World Aquatics Championships – Men's 100 metre butterfly Wikipedia
Prior to this competition, the existing world and championship records were:
The heats were held at 10:39.
The semifinals were held at 19:04.
The final was held at 18:43.