1999 Pan Pacific Swimming Championships – Men's 100 metre butterfly
The men's 100 metre butterfly competition at the 1999 Pan Pacific Swimming Championships took place on August 27–28 at the Sydney International Aquatic Centre. The last champion was Neil Walker 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:| World record | 52.15 | Brisbane, Australia | October 9, 1997 | |
| Pan Pacific Championships record | 52.76 | Fukuoka, Japan | August 12, 1997 |
Results
All times are in minutes and seconds.| KEY: | q | Fastest non-qualifiers | Q | Qualified | CR | Championships record | NR | National record | PB | Personal best | SB | Seasonal best |
Heats
The first round was held on August 27.| Rank | Name | Nationality | Time | Notes |
| 1 | Geoff Huegill | 52.86 | Q | |
| 2 | Scott Miller | 53.34 | Q | |
| 3 | Takashi Yamamoto | 53.64 | Q | |
| 4 | Michael Klim | 53.72 | Q | |
| 5 | Theo Verster | 53.86 | Q | |
| 6 | Dod Wales | 54.01 | Q | |
| 7 | Bryan Jones | 54.10 | Q | |
| 8 | Brock Newman | 54.37 | Q | |
| 9 | Mike Mintenko | 54.41 | Q | |
| 10 | Shamek Pietucha | 54.56 | Q | |
| 11 | Bill Kirby | 54.62 | Q | |
| 12 | Ryan Kelly | 54.89 | Q | |
| 13 | Justin Norris | 54.93 | Q | |
| 14 | Adam Sioui | 55.08 | Q | |
| 15 | Douglas Browne | 55.58 | Q | |
| 16 | Colin Sood | 55.59 | Q | |
| 17 | Uğur Taner | 55.81 | ||
| 18 | Ian Crocker | 55.83 | ||
| 19 | Ryo Takayasu | 55.91 | ||
| 20 | Joseph Marus | 56.18 | ||
| 21 | Han Kyu-Chul | 56.21 | ||
| 22 | Hisayoshi Tanaka | 56.24 | ||
| 23 | Nicholas Sheeran | 56.28 | ||
| 23 | Greg Shaw | 56.28 | ||
| 25 | Philip Weiss | 56.75 | ||
| 26 | Dean Kent | 57.80 | ||
| 27 | Tseng Cheng-hua | 58.16 | ||
| 28 | Merlin Fredericks | 1:02.00 |
Semifinals
The semifinals were held on August 27.| Rank | Name | Nationality | Time | Notes |
| 1 | Geoff Huegill | 52.45 | Q, CR | |
| 2 | Michael Klim | 52.76 | Q | |
| 3 | Scott Miller | 53.01 | Q | |
| 4 | Takashi Yamamoto | 53.14 | Q | |
| 5 | Dod Wales | 53.73 | Q | |
| 6 | Brock Newman | 53.94 | Q | |
| 7 | Mike Mintenko | 53.97 | Q | |
| 8 | Bryan Jones | 54.18 | Q | |
| 9 | Ian Crocker | 54.31 | ||
| 10 | Theo Verster | 54.34 | ||
| 11 | Bill Kirby | 54.52 | ||
| 12 | Ryan Kelly | 55.03 | ||
| 13 | Ryo Takayasu | 55.08 | ||
| 14 | Adam Sioui | 55.15 | ||
| 15 | Shamek Pietucha | 55.40 | ||
| 16 | Douglas Browne | 55.88 |
Final
The final was held on August 28.| Rank | Lane | Nationality | Time | Notes |
| Michael Klim | 52.49 | |||
| Geoff Huegill | 52.51 | |||
| Takashi Yamamoto | 52.93 | |||
| 4 | Dod Wales | 53.38 | ||
| 5 | Brock Newman | 53.86 | ||
| 6 | Mike Mintenko | 54.01 | ||
| 7 | Theo Verster | 54.28 | ||
| 8 | Ryan Kelly | 54.34 |