| 2017–18 LEN Champions League | |
| League: | LEN Champions League |
| Sport: | Water Polo |
| No Of Teams: | 16 (preliminary round) |
| Mvp: | Josip Pavic (Olympiacos) |
| Top Scorer: |  Darko Brguljan 42 goals (Hannover) |
| Finals: | Final Eight |
| Finals Champ: | Olympiacos (2nd title) |
| Finals Runner-Up: |  Pro Recco |
| Finals Mvp: | Josip Pavic (Olympiacos) |
| Seasonslist: | LEN Champions League |
| Seasonslistnames: | Champions League |
| Prevseason Link: | 2016–17 LEN Champions League |
| Prevseason Year: | 2016–17 |
| Nextseason Link: | 2018–19 LEN Champions League |
| Nextseason Year: | 2018–19 |
The 2017–18 LEN Champions League was the 55th edition of LEN's premier competition for men's water polo clubs.
12 teams are directly qualified for the preliminary round (TH: Champions League title holders).
| Preliminary Round | ||||
|---|---|---|---|---|
| Jug CO | Waspo 98 Hannover | Pro Recco |  Dynamo Moscow | |
  ZF Eger | Olympiacos | AZC Alphen |  Partizan | |
| Spandau 04 | Szolnoki VSCTH |  Steaua București |  CNA Barceloneta | |
| Qualification round II | ||||
| HAVK Mladost | NC Vouliagmeni | CSM Digi Oradea | Crvena zvezda | |
| CN Marseille | AN Brescia | Spartak Volgograd | CN Sabadell | |
| ASC Duisburg | UZSC Utrecht | |||
| Qualification round I | ||||
| Orvosegyetem SC | CN Terrassa | |||
| Mornar |  ASA Tel Aviv |  Enka SK | ||
| Strasbourg | Galatasaray | |||
| ANC Glyfada | ||||
The schedule of the competition is as follows.[1]
| Phase | Round | First leg | Second leg |
|---|---|---|---|
| Qualifying rounds | Qualification round I | 14–17 September 2017 | |
| Qualification round II | 28 September–1 October 2017 | ||
| Qualification round III | 14 October 2017 | 18 October 2017 | |
| Preliminary round | Matchday 1 | 25 October 2017 | |
| Matchday 2 | 8 November 2017 | ||
| Matchday 3 | 29 November 2017 | ||
| Matchday 4 | 9 December 2017 | ||
| Matchday 5 | 20 December 2017 | ||
| Matchday 6 | 13 January 2018 | ||
| Matchday 7 | 24 January 2018 | ||
| Matchday 8 | 7 February 2018 | ||
| Matchday 9 | 28 February 2018 | ||
| Matchday 10 | 14 March 2018 | ||
| Matchday 11 | 31 March 2018 | ||
| Matchday 12 | 18 April 2018 | ||
| Matchday 13 | 28 April 2018 | ||
| Matchday 14 | 9 May 2018 | ||
| Final Eight | Quarterfinals | 7 June 2018 | |
| Semifinals | 8 June 2018 | ||
| Final | 9 June 2018 | ||
|}
See main article: 2017–18 LEN Champions League preliminary round.
The draw for the group stage was held on 29 August 2017 in Budapest.[2] The 16 teams were drawn into two groups of eight.
In each group, teams play against each other home-and-away in a round-robin format. The group winners, runners-ups, third and fourth placed teams advance to the Final 8. The matchdays are 25 October, 8 and 29 November, 9 and 20 December 2017, 13 and 24 January, 7 and 28 February, 14 and 31 March, 18 and 28 April, 9 May 2018.
A total of 11 national associations are represented in the group stage.
| + Key to colors | ||||
| Advance to the Final Eight | Home team win | Draw | Away team win |
See main article: 2017–18 LEN Champions League Final Eight. 7–9 June 2018—Genoa, Italy
| width=25 | width=220 | Team | |
|---|---|---|---|
| Olympiacos | |||
| Pro Recco | |||
| CNA Barceloneta | |||
| 4 | Jug CO | ||
| 5 | Szolnoki VSC | ||
| 6 | ZF Eger | ||
| 7 | AN Brescia | ||
| 8 | Spandau 04 |
| Total 7 of the Season | ||||||
|---|---|---|---|---|---|---|
| [4] | LW | Francesco Di Fulvio (Pro Recco) | CF | Josip Vrlić(Barceloneta) | RW | Maro Joković(Jug) |
| LD | Ioannis Fountoulis (Olympiacos) | CB | Andro Bušlje (Olympiacos) | RD | Dušan Mandić (Pro Recco) | |
| GK | Josip Pavić (Olympiacos) | |||||