| 1999 NLL season | |
|---|---|
| League | National Lacrosse League |
| Sport | Indoor lacrosse |
| Duration | December 26, 1998 – April 23, 1999 |
| Number of games | 12 |
| Number of teams | 7 |
| Regular season | |
| League champions | Toronto Rock |
| Runners-up | Baltimore Thunder |
| Season MVP | Gary Gait (Baltimore Thunder) |
| Top scorer | Gary Gait (Baltimore Thunder) |
| Champion's Cup | |
| Champions | Toronto Rock |
| Runners-up | Rochester Knighthawks |
| Finals MVP | Colin Doyle (Toronto) |
The 1999 National Lacrosse League season is the 13th season in the NLL that began on December 26, 1998, and concluded with the championship game on April 23, 1999. The Toronto Rock celebrated their first season in Toronto by winning the championship, defeating the Rochester Knighthawks 13–10 at Maple Leaf Gardens.
The playoffs featured the lowest score by a team in NLL history, when goaltender Bob Watson and the Toronto Rock defeated the Philadelphia Wings 13–2.