| 1998 NLL season | |
|---|---|
| League | National Lacrosse League |
| Sport | Indoor lacrosse |
| Duration | January 3, 1998 - April 28, 1998 |
| Number of games | 12 |
| Number of teams | 7 |
| Regular season | |
| League champions | Philadelphia Wings |
| Runners-up | Baltimore Thunder |
| Season MVP | Gary Gait (Baltimore Thunder) |
| Top scorer | Gary Gait (Baltimore Thunder) |
| Champion's Cup | |
| Champions | Philadelphia Wings |
| Runners-up | Baltimore Thunder |
| Finals MVP | Dallas Eliuk (Philadelphia) |
Before the 1998 season, the Major Indoor Lacrosse League was renamed to be the National Lacrosse League, in the process increasing the length of the regular season from ten to twelve games. The first season as the NLL and the 12th season overall, began on January 3, 1998, and concluded with the second championship game on April 28. The championship was decided by a best-two-of-three series, with the Philadelphia Wings defeating the Baltimore Thunder 16–12 in the first game and 17–12 in the second.