Swimming at the 1973 World Aquatics Championships – Men's 100 metre breaststroke

The men's 100 metre breaststroke competition of the swimming events at the 1973 World Aquatics Championships took place on September 4.

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

The following records were established during the competition:

Heats
32 swimmers participated in 5 heats. The eight fastest times qualified for the final.

Final
The results of the final are below.