The 1990-1991 title race went right down to the wire with Wigan clinching the trophy with a 20-8 last day victory at Leeds. A backlog of fixtures saw coach John Monie dub the title run-in "Mission Impossible" as the club faced 8 matches in an 18 day spell. During that run-in Wigan dropped just one point in a draw at Bradford and beat title rivals Widnes 26-6 in a crucial match at Central Park.
Chorley add Borough to their name.
Oldham, Sheffield Eagles and Rochdale Hornets were demoted to the Second Division.
Salford, Halifax and Swinton were promoted to the First Division.