The Men's 100 metre breaststroke event at the 2002 Commonwealth Games took place between 31 July 2002 and 1 August 2002 at Manchester Aquatics Centre.

All times are Coordinated Universal Time (UTC) Prior to the competition, the existing world and championship records were as follows.

The heats were held the morning session on 31 July.

[1] The semifinals were held the evening session on 31 July.

[2] The final were held the evening session on 1 August.