The 1902–03 Northern Rugby Football Union season was the eighth season of rugby league football.

League Champions: Halifax Challenge Cup Winners: Halifax (7-0 v Salford) 2nd Division Champions: Keighley[1] At the end of the season Manningham Rugby Club decided to switch to association football and became Bradford City A.F.C., whilst staying at Valley Parade.

[2][3] Halifax beat Salford 7-0 in the final at Leeds before a crowd of 32,507 [5]