2002 Pan Pacific Swimming Championships – Men's 100 metre butterfly

The men's 100 metre butterfly competition at the 2002 Pan Pacific Swimming Championships took place on August 28–29 at the Yokohama International Swimming Pool. The last champion was Michael Klim of Australia.

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 28.

Semifinals
The semifinals were held on August 28.

Final
The final was held on August 29.