The men's 100 metre breaststroke event at the 2018 Commonwealth Games was held on 6 and 7 April at the Gold Coast Aquatic Centre.

Prior to this competition, the existing world, Commonwealth and Games records were as follows: The following records were established during the competition: The heats were held on 6 April at 11:00.

[1] The semifinals were held on 6 April at 20:32.

[2] The final was held on 7 April at 19:48.

[3]