The women's 100 metre breaststroke competition at the 2010 Pan Pacific Swimming Championships took place on August 19 at the William Woollett Jr. Aquatics Center.

[1][2][3] The last champion was Tara Kirk of US.

[6] Prior to this competition, the existing world and Pan Pacific records were as follows: All times are in minutes and seconds.

The first round was held on August 19, at 10:33.

[1] The B final was held on August 19, at 18:29.