| 59 from 30 nations|| 1:00.55|
| May 21, 2012 (heats and semifinals)
May 22, 2012 (final)|
The men's 100 metre breaststroke competition of the swimming events at the 2012 European Aquatics Championships took place May 21 and 22. The heats and semifinals took place on May 21, the final on May 22.
Swimming at the 2012 European Aquatics Championships – Men's 100 metre breaststroke Wikipedia
Prior to the competition, the existing world, European and championship records were as follows.
59 swimmers participated in 8 heats.
The eight fastest riders advanced to the final.
The final was held at 17:29.