LEN Euroleague 2009-10
| 2009-10 LEN Euroleague | |
|---|---|
| League | LEN Euroleague |
| Sport | Water Polo |
| Duration | 9 October 2009 to 15 May 2010 |
| Number of teams | 16 (Preliminary Round) 34 (Total) |
| Final Four | |
| Finals champions |
 Pro Recco (6th title) |
| Runners-up |  Primorac Kotor |
The LEN Euroleague 2009-2010 is the 47th edition of Europe's premier club water polo competition. It began on October 9 and ended on May 15.
The Euroleague is run in five phases:
Seeded countries
The eight countries with the best placed team in the preliminary rounds, or main group stage, in the previous year's competition, LEN Euroleague 2008–09 are seeded for this year's competition. Each seeded country earns 1 place in the main group stage, 1 place in the second qualifying round, and 1 place in the first qualifying round. These countries are:
Unseeded countries
All other countries were invited to enter up to two clubs into the first qualifying round.
The first legs were played on 24 March, and the second legs were played on 14 April 2010.
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