| Tourney Name: | CERS Cup |
| Year: | 2003–04 |
| Dates: | 6 December 2003 – 1 May 2004 |
| Num Teams: | 19 |
| Associations: | 5 |
| Champion Other: |  Reus Deportiu |
| Count: | 2 |
| Second Other: |  Bassano |
| Prevseason: | 2002–03 |
| Nextseason: | 2004–05 |
The 2003–04 CERS Cup was the 24th season of the CERS Cup, Europe's second club roller hockey competition organized by CERH. 19 teams from five national associations qualified for the competition as a result of their respective national league placing in the previous season. Following a preliminary phase and four knockout rounds, Reus Deportiu won its second consecutive title.
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