| 1998-99 LEN Champions League | |
|---|---|
| League | LEN Champions League |
| Sport | Water Polo |
| Duration | 1998 to 5 June 1999 |
| Number of teams | 8 (Preliminary Round) 16 (Total) |
| Final Four | |
| Finals champions |
|
| Runners-up | |
The 1998–99 LEN Champions League is the 36th edition of LEN's premier competition for men's water polo clubs. It ran from 1998 to 5 June 1999, and it is contested by 16 teams. The Final Four (semifinals, final, and third place game) will take place on June 4 and June 5 in Naples.