2002–03 LEN Champions League
The 2002–03 LEN Champions League was the 40th edition of LEN's premier competition for men's water polo clubs. It ran from 16 October 2002 to 17 May 2003, and it was contested by 29 teams. The Final Four took place on May 16 and May 17 in Genoa.
Preliminary round
| Key to colors in group tables |
| Group winners and runners-up advanced to [|Final four] |
Final Four ([Genoa])
Final standings
| Team | |
 |