| Venue: | Mont-Sainte-Anne, QC, Canada |
| Date: | 14–20 September 1998 |
| Events: | 9 |
| Previous: | 1997 |
| Next: | 1999 |
The 1998 UCI Mountain Bike World Championships were held in Mont-Sainte-Anne, Quebec, Canada from 14 to 20 September 1998. The disciplines included were cross-country and downhill. The event was the 9th edition of the UCI Mountain Bike World Championships and the second to be held in Canada, following the 1992 World Championships in Bromont.
| Cross-country | ||||
| Under 23 cross-country | ||||
| Junior cross-country | ||||
| Downhill | ||||
| Junior downhill |
| Cross-country | ||||
| Junior cross-country | ||||
| Downhill | ||||
| Junior downhill |