Olympiacós Sýndesmos Filáthlon Peiraiós is a major multi-sport club based in Piraeus, Greece. Olympiacos is parent to a number of different competitive departments which participate in football, basketball, volleyball, water polo, handball, athletics, swimming, table tennis and boxing amongst many others—and have won numerous European and domestic titles over the club's history.
Olympiacos Men's Waterpolo, commonly referred to as Olympiacos, Olympiacos Piraeus or with its full name as Olympiacos CFP, is the professional men's water polo department of the major Greek multi-sport club, Olympiacos CFP, based in Piraeus, Greece. The department was founded in 1925, one of the founding members of the Hellenic Swimming Federation, and their home ground is the Papastrateio Pool in Piraeus.
The LEN Women's Champions League, formerly known as LEN European Cup, LEN Champions Cup and LEN Euroleague Women, is the premier competition for women's water polo clubs of Europe and takes place every year. It is organized by the Ligue Européenne de Natation (LEN) and was created in 1987 as LEN European Cup.
The LEN Women's Euro Cup, formerly the Women's LEN Trophy, is LEN's second-tier competition for women's water polo clubs. It was first held in 2000 as the LEN Women's Cup Winners' Cup. It was contested for many seasons by around 15 teams, which could qualify for it either directly due to high ranking in their domestic league or by being eliminated at certain stages of the Champions' Cup. After the last reformations in the European competitions system by LEN, only four teams contesting for the trophy, coming after elimination at that season's LEN Euro League quarterfinals stage. Italy's Gifa Palermo, Ortigia, Racing Roma, Imperia, Russia's Shturm Ruza, and Greece's Ethnikos Piraeus are the most successful clubs in the competition with two titles each.
The Greek Women's Water Polo A1 League is the premier championship for women's water polo teams in Greece. It was founded in 1988, and it is currently contested by twelve teams. Greek League is ranked as one of the top national domestic leagues in European water polo. The champion, the runner-up and the third-placed team qualify for the LEN Euro League.
Olympiacos Women's Water Polo Club is the women's water polo department of the major Greek multi-sport club Olympiacos, based in Piraeus. The department was founded in 1988 and they play their games at the 1000-seated Papastrateio "Petros Kapagerof" Pool in Piraeus.
The LEN Women's Super Cup is an annual water polo match organized by the LEN and contested by the reigning champions of the two European club competitions, the Euro League and the LEN Trophy.
Alkisti Avramidou is a female Greek former water polo player.
The Piraeus derby, is an association football and water polo rivalry between Ethnikos Piraeus and Olympiacos, the 2 teams representing the city of Piraeus, Greece.
The 2015–16 LEN Women's Champions' Cup was the 29th edition of LEN's premier competition for women's water polo clubs.
The 2014–15 LEN Women's Champions' Cup was the 28th edition of LEN's premier competition for women's water polo clubs, running from 15 January 2015 to 25 April 2015. This was the second edition of the new format which saw twenty teams from thirteen countries.
The 2017 Women's LEN Super Cup was the 12th edition of the annual trophy organised by LEN and contested by the reigning champions of the two European competitions for women's water polo clubs. The contending teams were Russia's Kinef Kirishi and Hungary's UVSE. The match was played just before the Men's Super Cup at the Császár-Komjádi Béla Uszoda, in Budapest, on 4 November 2017.
The 2018 Women's LEN Super Cup was the 13th edition of the annual trophy organised by LEN and contested by the reigning champions of the two European competitions for women's water polo clubs. The match was played between Kinef Kirishi and Dunaújvárosi FVE at the Neftyanik Sports Complex in Kirishi, Russia, on 10 November 2018.
The 2018–19 LEN Euro League Women was the 32nd edition of the major European tournament for women's water polo clubs. It ran from 24 January to 20 April 2019.
The 2017–18 LEN Euro League Women was the 31st edition of the top tier European tournament for women's water polo clubs. It ran from 1 December 2017 to 21 April 2018.
The 2021–22 LEN Euro League Women is the 34th edition of the major competition for European women's water polo clubs. It started on 18 November 2021.
The 2022–23 Women's LEN Euro Cup is the 24th edition of the European second-tier tournament for women's water polo clubs. Sixteen teams participated in the competition. Ethnikos Piraeus is the defending champion.
The 2022 Women's LEN Super Cup was the 16th edition of the annual trophy organised by LEN and contested by the reigning champions of the two European competitions for Women's water polo clubs. The match was an all-Greek derby between European champions Olympiacos Piraeus and Ethnikos Piraeus. The match was held in Piraeus, Greece, on 17 December 2022.
The 2023–24 LEN Women's Champions League is the 36th edition of the water polo competition organised by the Ligue Européenne de Natation (LEN). This is the first season under the new changes made by LEN. The defending champions are Astralpool Sabadell.
The 2023–24 LEN Champions League is the 61st edition of LEN's premier competition for men's water polo clubs. Because of the congested schedule, there's a new format this year. Pro Recco are the three time defending champions.
Greece 
Kinef Kirishi