| Super League IV | |
|---|---|
| League | Super League |
| Duration | 30 Rounds |
| Teams | 14 |
| Highest attendance | 24,020 Bradford Bulls vs Leeds Rhinos (3 Sept) |
| Lowest attendance | 1,580 Gateshead Thunder vs Hull Sharks (19 May) |
| Broadcast partners | Sky Sports |
| 1999 Season | |
| Champions | St. Helens 2nd Super League title 9th British title |
| League Leaders | Bradford Bulls |
| Man of Steel |  Adrian Vowles |
| Top point-scorer(s) |  Iestyn Harris (325) |
| Top try-scorer(s) |  Toa Kohe-Love (25) |
| Left League | |
| Merged with Hull FC Merger with Huddersfield Giants | Gateshead Thunder; Sheffield Eagles |
JJB Sports Super League IV was the official name for the year 1999's Super League championship season, the 105th season of top-level professional rugby league football in Britain, and the fourth championship run by the Super League. The start of Super League IV saw the emergence of a North East based Rugby League Club, Gateshead Thunder as well as newly promoted Wakefield Trinity Wildcats to expand the league to fourteen teams.