| Super League III | |
|---|---|
| League | Super League |
| Duration | 23 Rounds |
| Teams | 12 |
| Highest attendance | 19,188 Bradford Bulls vs Leeds Rhinos (12 April) |
| Lowest attendance | 2,014 London Broncos vs Huddersfield Giants (23 Aug) |
| Broadcast partners | Sky Sports |
| 1998 Season | |
| Champions | Wigan Warriors 1st Super League title 18th British title |
| League Leaders | Wigan Warriors |
| Man of Steel |  Iestyn Harris |
| Top point-scorer(s) | Iestyn Harris (255) |
| Top try-scorer(s) |  Anthony Sullivan (20) |
| New franchise | |
| Awarded to | Gateshead Thunder |
| Promotion and relegation | |
| Promoted from Division One | Hull Sharks Huddersfield Giants |
JJB Sports Super League III was the official name for the year 1998's Super League championship season, the 104th season of top-level professional rugby league football in Britain, and the third season played in summer.
The League format changed in 1998, with a playoff series being used to determine the Super League Champions for th first time since the 1972–73 season.
The team which finished on the top of the table were, from this season, awarded the League Leaders' Shield, with the inaugural honours going to Wigan. Huddersfield Giants, the league's bottom club was saved from relegation in 1998 due to the expansion of the league to fourteen teams in Super League IV. The season culminated in the grand final between Leeds Rhinos and Wigan Warriors, which Wigan won, claiming the 1998 Championship.