Aberdare, Barry and Mid-Rhondda had dropped out, leaving 28 teams.

After finishing top of the regular season table, they went on to beat Wigan 13-7 in the play-off final.

At the close of the season, the Northern Union's leading players were selected to go on the 1910 Great Britain Lions tour of Australia and New Zealand.

Leeds played Hull in the Challenge Cup Final the match ended in a 7-7 draw.

[2][3] First match Leeds: 7 Leeds Tries: Walter Goldthorpe Leeds Goals: Frank Young 2 Hull FC: 7 Hull FC Tries: G. T. Cottrell Hull FC Goals: (E. or Ned) Rogers, Harry Wallace Half-time: 2-7 Attendance: 19,413 (at Fartown Ground, Huddersfield) Teams: Hull FC: Harry Taylor, G. T. Cottrell, Jim Devereux, Andy Morton, (E. or Ned) Rogers, Harry Wallace, Billie Anderson, Tom Herridge, Will Osborne, Dick Taylor, William Holder, G. Connell, H. Walton Leeds: Frank Young, J. Fawcett, Walter Goldthorpe, C. Gillie, F. Barron, E. Ware, J. Sanders, W. Biggs, Billy Jarman, Fred Harrison, Harry Topham, Fred Webster, Billy Ward Replay Leeds: 26 Leeds Tries: Rowe, Walter Goldthorpe, Fred Webster, Harry Topham Leeds Goals: Frank Young 7 Hull FC: 12 Hull FC Tries: G. Connell, H. Walton Hull FC Goals: (E. or Ned) Rogers 3 Half-time: 16-0 Attendance: 11,608 (at Fartown Ground, Huddersfield) Teams: Leeds: Frank Young, Harold Rowe, Walter Goldthorpe, C. Gillie, F. Barron, E. Ware, J. Fawcett, Fred Webster, Fred Harrison, Harry Topham, Billy Ward, Billy Jarman, S. Whittaker Hull FC: E. Rogers, G. T. Cottrell, Jim Devereux, Andy Morton, Ernest Atkinson, (G. or Ned) Rogers, Harry Wallace, Tom Herridge, Will Osborne, Dick Taylor, William Holder, G. Connell, H. Walton