1980–81 Rugby Football League season
|Slalom Lager Championship|
|Number of teams||16|
|Premiership winners||Hull Kingston Rovers|
|Man of Steel||Ken Kelly|
|Top point-scorer(s)||Steve Hesford 310|
|Top try-scorer(s)||Terry Richardson 28|
|Promotion and relegation|
|Promoted from Second Division|| York
|Relegated to Second Division|| Halifax
|Top try-scorer(s)||John Crossley 35|
The 1980–81 Rugby Football League season was the 86th ever season of professional rugby league football in Britain. Sixteen teams competed from August, 1980 until May, 1981 for the Slalom Lager Championship.
- Slalom Lager League Champions: Bradford Northern
- Challenge Cup Winners: Widnes (18-9 v Hull Kingston Rovers)
- Slalom Lager Premiership Trophy Winners: Hull Kingston Rovers (11-7 v Hull)
- John Player Special Trophy Winners: Warrington (12-5 v Barrow)
- 2nd Division Champions: York
For the only time in their history, Wigan competed outside the top flight of Rugby League in this season. Fulham RLFC joined the competition in Division Two, later becoming the London Crusaders, London Broncos (twice), and Harlequins Rugby League.
Bradford Northern finished on top of the First Division table to claim their fifth championship, and Hull Kingston Rovers won the Rugby League Premiership competition.
The Final was played at Wembley before a crowd of 92,496.