1903–04 Challenge Cup
| Duration | 6 rounds | 
|---|---|
| Highest attendance | 17,041 | 
| Winners | Halifax | 
| Runners-up | Warrington | 
The 1903–04 Challenge Cup was the 8th staging of rugby league's oldest knockout competition, the Challenge Cup.
Halifax became the second team to record back-to-back Cup wins but would not reach another final until 1921, nor win the Cup again until 1931.