Swimming at the 2015 World Aquatics Championships – Men's 100 metre breaststroke

The Men's 100 metre breaststroke competition of the swimming events at the 2015 World Aquatics Championships was held on 2 August with the heats and the semifinals and 3 August with the final.

Records
Prior to the competition, the existing world and championship records were as follows.

The following new records were set during this competition.

Heats
The heats were held at 11:34.

Semifinals
The semifinals were held on 2 August at 18:35.

Final
The final was held on 3 August at 17:32.