The 2003–04 Euroleague was the fourth season of the professional basketball competition for elite clubs throughout Europe, organised by Euroleague Basketball Company, and it was the 47th season of the premier competition for European men's clubs overall.

The final of the competition was held in Nokia Arena, Tel Aviv, Israel, with hosts Maccabi Elite Tel Aviv,[1] defeating Skipper Bologna, by a score of 118-74.

The complete list of tiebreakers was provided in the lead-in to the Regular Season results.

If one or more clubs were level on won-lost record, tiebreakers were applied in the following order: The surviving teams were divided into four groups of four teams each, and again a round robin system was adopted resulting in 6 games each, with the top team advancing to the Final Four.

This was the last season in which teams advanced directly from the Top 16 to the Final Four.