| Event: | Men's 100 metre freestyle |
| Competition: | 1998 FINA World Championships |
| Date: | 14 January 1998 |
| Competitors: | 83 |
| Win Value: | 48.93 seconds |
| Gold: | Alexander Popov |
| Goldnoc: | RUS |
| Silver: | Michael Klim |
| Silvernoc: | AUS |
| Bronze: | Lars Frölander |
| Bronzenoc: | SWE |
| Prev: | 1994 |
| Next: | 2001 |
The finals and the qualifying heats of the men's 100 metre freestyle event at the 1998 World Aquatics Championships were held on Wednesday 14 January 1998 in Perth, Western Australia.
| width=50 | Rank ! | width=300 | Name ! | width=100 | Time ! | width=100 | Notes |
|---|---|---|---|---|---|---|---|
| 1 | 49.33 | ||||||
| 2 | 49.57 | ||||||
| 3 | 49.61 | ||||||
| 4 | 49.70 | ||||||
| 5 | 49.86 | ||||||
| 6 | 49.87 | ||||||
| 7 | 50.21 | ||||||
| 8 | 50.29 | ||||||
| 9 | 50.35 | ||||||
| 10 | 50.37 | ||||||
| 11 | 50.39 | ||||||
| 12 | 50.40 | ||||||
| 14 | 50.42 | ||||||
| 15 | 50.43 | ||||||
| 16 | 50.52 | ||||||
| 17 | 50.57 | ||||||
| 18 | 50.64 | ||||||
| 19 | 50.68 | ||||||
| 21 | 50.74 | ||||||
| 22 | 50.76 | ||||||
| 23 | 50.79 | ||||||
| 24 | 50.93 | ||||||
| 25 | 51.03 | ||||||
| 26 | 51.16 | ||||||
| 27 | 51.17 | ||||||
| 28 | 51.22 | ||||||
| 29 | 51.40 | ||||||
| 30 | 51.42 | ||||||
| 31 | 51.54 | ||||||
| 32 | 51.58 | ||||||
| 33 | 51.59 | ||||||
| 34 | 51.63 | ||||||
| 35 | 51.64 | ||||||
| 36 | 51.79 | ||||||
| 37 | 51.87 | ||||||
| 38 | 51.94 | ||||||
| 39 | 51.97 |
| width=50 | Rank ! | width=300 | Name ! | width=100 | Time ! | width=100 | Notes |
|---|---|---|---|---|---|---|---|
| 48.93 | CR | ||||||
| 49.20 | |||||||
| 49.53 | |||||||
| 4 | 49.59 | ||||||
| 5 | 49.62 | ||||||
| 6 | 49.82 | ||||||
| 7 | 49.95 | ||||||
| 8 | 50.36 |
| width=50 | Rank ! | width=300 | Name ! | width=100 | Time ! | width=100 | Notes |
|---|---|---|---|---|---|---|---|
| 9 | 49.90 | ||||||
| 10 | 50.18 | ||||||
| 11 | 50.19 | ||||||
| 12 | 50.38 | ||||||
| 13 | 50.41 | ||||||
| 15 | 50.66 | ||||||
| 16 | 50.72 |