| Prevseason: | 2002–03 |
| Nextseason: | 2004–05 |
| ULEB Cup | |
| T Bg: |
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| T Color: |
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| Season: | 2003–04 |
| Champions: |  Hapoel Jerusalem 1st title |
| Runners Up: |  Real Madrid |
| Teams: | 36 (competition proper) |
| Finals Mvp N: | RUS |
| Finals Mvp Link: | EuroCup Basketball Finals MVP |
| Pir: | 28.0 |
| Pir N: | BUL |
| Ppg: | 26.6 |
| Ppg N: | USA |
| Rpg: | 11.5 |
| Rpg N: | NED |
| Apg: | 4.8 |
| Apg N: | CRO |
The 2003–04 ULEB Cup was the second season of the second-tier level European professional club basketball competition, EuroCup Basketball, organized by the Euroleague Basketball Company. The EuroCup is the European-wide league level that is one tier below the EuroLeague level. Thirty-six teams participated in the competition. The final was held on April 13, in Charleroi, Belgium, between Real Madrid and Hapoel Jerusalem, the latter winning it by a score of 83–72.
For the first time teams from Israel, Lithuania, Greece, Latvia, Bulgaria, Poland, Austria and England joined the competition which was undisputedly considered now the 2nd tier of European club basketball. Three out of the 36 teams were domestic champions.
| Country | Teams! | Clubs | ||||||
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The 2003–04 ULEB Cup featured a total of 36 teams, divided into six groups of six. The round-robin group stage was followed by knock-out stages. The regular season began in November 2003.
All 36 teams in 6 groups played a round-robin competition, home and away. Two teams from each group advanced to the knockout stage (eighth-finals). Four teams with best third place records in their respective groups also advanced to the knockout stage.
The winners from the eighthfinals advanced to the quarterfinals. The matches were played as two games, home and away. The match winners were determined by point differential.
The winners from the quarterfinals advanced to the semifinals. The matches were played as two games, home and away. The match winners were determined by point differential.
The winners from the semifinals advanced to the finals. The matches were played as two games, home and away. The match winners were determined by point differential.
The match was played as one game.
| Top two places in each group, plus highest-ranked third-place team, advance to Top 16 |
Group A
| Group B
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Group C
| Group D
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Group E
| Group F
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Source: ULEB Cup
See main article: 2003–04 ULEB Cup Top 16.
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See main article: 2003–04 ULEB Cup Quarter finals.
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See main article: 2003–04 ULEB Cup Semi finals.
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April 13, Spiroudome, Charleroi|}
