| 2008–09 LEN Euroleague | |
| League: | LEN Euroleague |
| Sport: | Water Polo |
| Duration: | 2 October 2008 to 23 May 2009 |
| No Of Teams: | 16 (preliminary round) 43 (total) |
| Playoffs: | Final Four |
| Playoffs Link: | 2008–09 LEN Euroleague#Final Four (Rijeka) |
| Finals Champ: |  Primorac Kotor (1st title) |
| Seasonslist: | LEN Champions League |
| Seasonslistnames: | Euroleague |
| Prevseason Link: | 2007–08 LEN Euroleague |
| Prevseason Year: | 2007–08 |
| Nextseason Link: | 2009–10 LEN Euroleague |
| Nextseason Year: | 2009–10 |
The LEN Euroleague 2008–09 was the 46th edition of Europe's premier club water polo competition.
| Group winners and runners-up advanced to the Quarter-finals |
The first legs were played on 4 April, and the second legs were played on 22 April 2009.
| width=25 | ! | width=220 | Team |
|---|---|---|---|
| Primorac Kotor | |||
 Pro Recco | |||
| Jug Dubrovnik | |||
| HAVK Mladost |