2010 Pan Pacific Swimming Championships – Men's 100 metre butterfly

The men's 100 metre butterfly competition at the 2010 Pan Pacific Swimming Championships took place on August 20 at the William Woollett Jr. Aquatics Center. The last champion was Ian Crocker of US.

This race consisted of two lengths of the pool, all in butterfly.

Records
Prior to this competition, the existing world and Pan Pacific records were as follows:

Results
All times are in minutes and seconds.

Heats
The first round was held on August 20, at 11:01.

B Final
The B final was held on August 20, at 18:55.

A Final
The A final was held on August 20, at 18:55.