| Event: | Men's 100 metre breaststroke |
| Competition: | 1998 FINA World Championships |
| Date: | 12 January 1998 |
| Competitors: | 33 |
| Win Value: | 1 minute 1.34 seconds |
| Gold: | Frédérik Deburghgraeve |
| Goldnoc: | BEL |
| Silver: | Zeng Qiliang |
| Silvernoc: | CHN |
| Bronze: | Kurt Grote |
| Bronzenoc: | USA |
| Prev: | 1994 |
| Next: | 2001 |
The finals and the qualifying heats of the men's 100 metre breaststroke event at the 1998 World Aquatics Championships were held on Monday 12 January 1998 in Perth, Western Australia.
| Rank | Name | Time | |
|---|---|---|---|
| 1:01.34 | |||
| 1:01.76 | |||
| 1:01.93 | |||
| 4 | 1:02.01 | ||
| 5 | 1:02.13 | ||
| 6 | 1:02.47 | ||
| 7 | 1:02.53 | ||
| 8 | 1:03.11 |
| Rank | Name | Time | |
|---|---|---|---|
| 9 | 1:02.62 | ||
| 10 | 1:03.09 | ||
| 11 | 1:03.15 | ||
| 12 | 1:03.16 | ||
| 13 | 1:03.27 | ||
| 14 | 1:03.31 | ||
| 15 | 1:03.33 | ||
| 16 | 1:03.54 |
| Rank | Name | Time | |
|---|---|---|---|
| 1 | 1:01.99 | ||
| 2 | 1:02.18 | ||
| 3 | 1:02.22 | ||
| 4 | 1:02.34 | ||
| 5 | 1:02.45 | ||
| 6 | 1:02.48 | ||
| 7 | 1:02.75 | ||
| 8 | 1:02.83 | ||
| 9 | 1:02.84 | ||
| 10 | 1:02.85 | ||
| 11 | 1:02.92 | ||
| 12 | 1:02.99 | ||
| 13 | 1:03.00 | ||
| 14 | 1:03.01 | ||
| 15 | 1:03.19 | ||
| 16 | 1:03.27 | ||
| 17 | 1:03.30 | ||
| 18 | 1:03.36 | ||
| 19 | 1:03.37 | ||
| 20. | 1:03.41 | ||
| 22 | 1:03.67 | ||
| 23 | 1:03.69 | ||
| 24 | 1:03.91 | ||
| 25 | 1:03.92 | ||
| 26 | 1:04.11 | ||
| 27 | 1:04.12 | ||
| 28 | 1:04.21 | ||
| 29 | 1:04.48 | ||
| 30 | 1:05.20 | ||
| 31 | 1:05.35 | ||
| 32 | 1:05.38 | ||
| 33 | 1:05.45 |