1905–06 Northern Rugby Football Union season

Leigh won the Championship for the first time this season and Bradford their first Challenge Cup.

The two divisions were combined into one competition, with Lancaster dropping out to reduce it to 31 teams.

Clubs from the same county all played each other, and arranged inter-county matches as and when they could.

Because not all clubs played the same number of matches positions were decided on percentages.

[1] Featherstone Rovers, who were an amateur team at this time knocked a professional side out of the Challenge Cup, when they beat Widnes 23-2 in the second round.