Swimming at the 2023 World Aquatics Championships – Men's 100 metre breaststroke

The men's 100 metre breaststroke competition at the 2023 World Aquatics Championships was held on 23 and 24 July 2023.

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

Heats
The heats were started on 22 July at 12:26.

Semifinals
The semifinals were held on 23 July at 20:50.

Final
The final was held on 24 July at 20:02.