| 2019–20 LEN Champions League | |
| League: | LEN Champions League |
| Sport: | Water Polo |
| Duration: | 30 August 2019 – 4 March 2020 (canc.) |
| No Of Teams: | 32 |
| Finals: | Final Eight |
| Seasonslist: | LEN Champions League |
| Seasonslistnames: | Champions League |
| Prevseason Link: | 2018–19 LEN Champions League |
| Prevseason Year: | 2018–19 |
| Nextseason Link: | 2020–21 LEN Champions League |
| Nextseason Year: | 2020–21 |
The 2019–20 LEN Champions League was the 57th edition of LEN's premier competition for men's water polo clubs. The season started on 30 September 2019 and played its last games on 4 March 2020 due to the COVID-19 pandemic.
| width=25% | Jug Dubrovnik | width=25% | Spandau 04 | width=25% |  Ferencváros | |
| width=25% | Mladost Zagreb | width=25% | Waspo 98 Hannover | width=25% |  Pro Recco | |
| width=25% |  CN Marseille | width=25% | Olympiacos | width=25% |  Jadran Herceg Novi | |
| width=25% |  Dinamo Tbilisi | width=25% | Szolnok | width=25% |  CNA Barceloneta |
| width=25% | Jadran Split | width=25% | OSC Potsdam | width=25% | AN Brescia |
| width=25% | Strasbourg | width=25% | NC Vouliagmeni | width=25% | CN Terrassa |
| width=25% | Locomotive Tbilisi | width=25% | OSC Budapest |
| width=25% |  Banja Luka | width=25% |  Steaua Bucharest | width=25% |  Crvena zvezda | |
| width=25% | Paix d’Aix Natation | width=25% |  Dynamo Moscow | width=25% | CN Barcelona | |
| width=25% | Apollon Smyrni | width=25% | Sintez Kazan | width=25% |  Galatasaray | |
| width=25% | Oradea | width=25% | Šabac | width=25% | Enka |
The schedule of the competition is as follows.[1]
| Phase | Round | 1st leg | 2nd leg |
|---|---|---|---|
| Qualifying rounds | Qualification round I | 30 August–1 September 2019 | |
| Qualification round II | 13–15 September 2019 | ||
| Qualification round III | 21 September 2019 | 25 September 2019 | |
| Preliminary round | Round 1 | 8/9 October 2019 | |
| Round 2 | 18/19 October 2019 | ||
| Round 3 | 29/30 October 2019 | ||
| Round 4 | 8/9 November 2019 | ||
| Round 5 | 19/20 November 2019 | ||
| Round 6 | 3/4 December 2019 | ||
| Round 7 | 13/14 December 2019 | ||
| Round 8 | 4/5 February 2020 | ||
| Round 9 | 21/22 February 2020 | ||
| Round 10 | 3/4 March 2020 | ||
| Round 11 | 13/14 March 2020 | ||
| Round 12 | 21/22 April 2020 | ||
| Round 13 | 8/9 May 2020 | ||
| Round 14 | 19/20 May 2020 | ||
| Final 8 | Quarterfinals | 5 June 2020 | |
| Semifinals | 6 June 2020 | ||
| Final | 7 June 2020 | ||
|}
The draw for the 2019–20 LEN Champions League preliminary round has been conducted in Barcelona. In the regular season, teams will play against each other home-and-away in a round-robin format. The top four teams in group A and the top three teams in group B will advance to the Final 8. Also, Pro Recco will participate in the Final 8 as the host of tournament. The matchdays will be from 8 October 2019 to 20 May 2020.[2] Teams are ranked according to points (3 points for a win, 1 point for a draw, 0 points for a loss), and if tied on points, the following tiebreaking criteria are applied, in the order given, to determine the rankings:
| + Key to colors | ||||
| Advance to the Final 8 | Home team win | Tie | Away team win |
5–7 June 2020, Recco, Italy.[3] [4]
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