Olympiacos is one of the most successful clubs in European Water Polo, having won the LEN Euroleague in 2015[1] and the LEN Trophy in 2014[2] and having, overall, a commanding presence in European competitions. Besides their LEN Euroleague and LEN Trophy titles, they were runners-up of the LEN Super Cup in 2014 and runners-up of the LEN Trophy in 2008[3] and they have participated, altogether, in 4 Champions' Cup / Euroleague Final Fours (1996, 2010, 2011, 2015),[4] as well as in 4 LEN Trophy Final Fours (2001, 2007, 2008, 2014), being semi-finalists of the same competition in 2009 and 2012.[5][6]
In 2014 Olympiacos won the LEN Trophy in the Final Four in Florence, beating home team Firenze 10–9 in the final. One year later, Olympiacos were crowned European Champions,[7] winning the LEN Euroleague in the 2015 Final Four in Piraeus, after a thrilling, hard-fought 10–9 win in the final against the then-reigning champions Sabadell, who were undefeated for more than 3 years with 115 consecutive wins in all competitions.[8] Olympiacos lifted the LEN Euroleague title undefeated and having won 8 straight matches without even a single draw.
After the 2015 LEN Euroleague win of Olympiacos Women's Water Polo team, Olympiacos CFP became the only multi-sport club in European Water Polo history after Pro Recco to have been crowned European Champions with both the Men's and the Women's departemts,[9] and the only club with both its departments currently active (Pro Recco Women's department has been dissolved since 2012).[10]
In Greece, Olympiacos have won six Greek Championships, being one of the most successful clubs domestically. They won their first two titles in 1995 and 1998, but their best performance in the league came after coach Charis Pavlidis' arrival in 2007. In 2009, they managed to seize the Championship from rivals NC Vouliagmeni who had the home-court advantage, winning the best-of-five series 3–2. Beginning from season 2010–11, Olympiacos won three Greek Championshps in five years (2011, 2014, 2015), beating rivals NC Vouliagmeni in the finals on all three occasions, despite the fact that Vouliagmeni had the home-court advantage in both the 2011 and 2014 finals.