The women's 100 metre breaststroke event at the 2018 Commonwealth Games was held on 8 and 9 April at the Gold Coast Aquatic Centre.

Prior to this competition, the existing world, Commonwealth and Games records were as follows: The heats were held on 8 April at 11:47.

[1] The semifinals were held on 8 April at 21:03.

[2] The final was held on 9 April at 21:12.

[3]