The A1 Ethniki (), often referred to as the Greek Water Polo League, is the highest professional water polo league in Greece. It is run by the Hellenic Swimming Federation. It is considered one of the top national leagues in European water polo, as its clubs have made significant success in European competitions.

Olympiacos Piraeus has conquered the most Greek League titles, with 39. Ethnikos also has the record for consecutive championships, with 18.

History 1923-27: Panhellenic Championship (held by SEGAS) 1927–28 to 1965-66: Panhellenic Championship (held by Hellenic Swimming Federation) 1966–67 to 1985-86: A Ethniki (held by Hellenic Swimming Federation) 1986–87 to present: A1 Ethniki (held by Hellenic Swimming Federation)

Title holders

1922–23 Peiraikos 1925–26 Ethnikos Piraeus 1926–27 Olympiacos Piraeus 1927–28 Aris Thessaloniki 1928–29 Aris Thessaloniki (2) 1929–30 Aris Thessaloniki (3) 1930–31 Ethnikos Piraeus (2) 1931–32 Aris Thessaloniki (4) 1932–33 Olympiacos Piraeus (2) 1933–34 Olympiacos Piraeus (3) 1934–35 NO Patras 1935–36 Olympiacos Piraeus (4) 1936–37 NO Patras (2) 1937–38 NO Patras (3) 1938–39 NO Patras (4) 1939–40 NO Patras (5) 1941–44 Not held due to WW II 1944–45 NO Patras (6) 1945–46 NO Patras (7) 1946–47 Olympiacos Pireaus (5) 1947–48 Ethnikos Piraeus (3) 1948–49 Olympiacos Piraeus (6) 1949–50 NO Patras (8) 1950–51 Olympiacos Piraeus (7) 1951–52 Olympiacos Piraeus (8) 1952–53 Ethnikos Piraeus (4) 1953–54 Ethnikos Piraeus (5) 1954–55 Ethnikos Piraeus (6) 1955–56 Ethnikos Piraeus (7) 1956–57 Ethnikos Piraeus (8) 1957–58 Ethnikos Piraeus (9) 1958–59 Ethnikos Piraeus (10) 1959–60 Ethnikos Piraeus (11) 1960–61 Ethnikos Piraeus (12) 1961–62 Ethnikos Piraeus (13) 1962–63 Ethnikos Piraeus (14) 1963–64 Ethnikos Piraeus (15) 1964–65 Ethnikos Piraeus (16) 1965–66 Ethnikos Piraeus (17) 1966–67 Ethnikos Piraeus (18) 1967–68 Ethnikos Piraeus (19) 1968–69 Ethnikos Piraeus (20) & Olympiacos Piraeus (9)Official Decision of General Secretariat Athletic by President C.Aslanidis - 24/09/1969 1969–70 Ethnikos Piraeus (21) 1970–71 Olympiacos Piraeus (10) 1971–72 Ethnikos Piraeus (22) 1972–73 Ethnikos Piraeus (23) 1973–74 Ethnikos Piraeus (24) 1974–75 Ethnikos Piraeus (25) 1975–76 Ethnikos Piraeus (26) 1976–77 Ethnikos Piraeus (27) 1977–78 Ethnikos Piraeus (28) 1978–79 Ethnikos Piraeus (29) 1979–80 Ethnikos Piraeus (30) 1980–81 Ethnikos Piraeus (31) 1981–82 Ethnikos Piraeus (32) 1982–83 Ethnikos Piraeus (33) 1983–84 Ethnikos Piraeus (34) 1984–85 Ethnikos Piraeus (35) 1985–86 ANO Glyfada 1986–87 ANO Glyfada (2) 1987–88 Ethnikos Piraeus (36) 1988–89 ANO Glyfada (3) 1989–90 ANO Glyfada (4) 1990–91 NO Vouliagmeni 1991–92 Olympiacos Piraeus (11) 1992–93 Olympiacos Piraeus (12) 1993–94 Ethnikos Piraeus (37) 1994–95 Olympiacos Piraeus (13) 1995–96 Olympiacos Piraeus (14) 1996–97 NO Vouliagmeni (2) 1997–98 NO Vouliagmeni (3) 1998–99 Olympiacos Piraeus (15) 1999–00 Olympiacos Piraeus (16) 2000–01 Olympiacos Piraeus (17) 2001–02 Olympiacos Piraeus (18) 2002–03 Olympiacos Piraeus (19) 2003–04 Olympiacos Piraeus (20) 2004–05 Olympiacos Piraeus (21) 2005–06 Ethnikos Piraeus (38) 2006–07 Olympiacos Piraeus (22) 2007–08 Olympiacos Piraeus (23) 2008–09 Olympiacos Piraeus (24) 2009–10 Olympiacos Piraeus (25) 2010–11 Olympiacos Piraeus (26) 2011–12 NO Vouliagmeni (4) 2012–13 Olympiacos Piraeus (27) 2013–14 Olympiacos Piraeus (28) 2014–15 Olympiacos Piraeus (29) 2015–16 Olympiacos Piraeus (30) 2016–17 Olympiacos Piraeus (31) 2017–18 Olympiacos Piraeus (32) 2018–19 Olympiacos Piraeus (33) 2019–20 Olympiacos Piraeus (34) 2020–21 Olympiacos Piraeus (35) 2021–22 Olympiacos Piraeus (36) 2022–23 Olympiacos Piraeus (37) 2023–24 Olympiacos Piraeus (38) 2024–25 Olympiacos Piraeus (39) 2025–26 Olympiacos Piraeus (40)

Titles by club No. Club Winners Winning years1. Olympiacos Piraeus 40 1927, 1933, 1934, 1936, 1947, 1949, 1951, 1952, 1969*, 1971, 1992, 1993, 1995, 1996, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026 2. Ethnikos Piraeus 38 1926, 1931, 1948, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969*, 1970, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1988, 1994, 2006 3. NO Patras 8 1935, 1937, 1938, 1939, 1940, 1945, 1946, 1950 4. Aris Thessaloniki 4 1928, 1929, 1930, 1932 5. ANO Glyfada 4 1986, 1987, 1989, 1990 6. NO Vouliagmeni 4 1991, 1997, 1998, 2012 7. Peiraikos 1 1923 * The 1969 Championship was shared between Olympiacos and Ethnikos

Consecutive championships

18 in a row Ethnikos Piraeus→1953–1970

14 in a row Ethnikos Piraeus→1972–1985

Olympiacos Piraeus→2013–2026

9 in a row Olympiacos Piraeus→1999–2005

6 in a row NO Patras→1937–1946

5 in a row Olympiacos Piraeus→2007–2011

3 in a row Aris Thessaloniki→1928–1930

2 in a row Olympiacos→1933–1934, 1951–1952, 1992–1993, 1995–1996

ANO Glyfada→1986–1987, 1989–1990

NO Vouliagmeni→1997–1998

Appearances in A' Ethniki (1967―2026) A' Ethniki (National Division) started in 1967, but the Greek championship started in 1923 as a Panhellenic Championship. The Hellenic Swimming Federation declares all championship winning teams as champions from 1928 and onwards. Teams in bold participate in the 2025–26 season. Club60 Olympiacos S.F. Piraeus58 Ethnikos O.F. Piraeus51 Chios Nautical Club 48 Panathinaikos Athens47 NO Patras46 Vouliagmeni Nautical Club46 Glyfada Athletic Nautical Club38 Palaio Faliro Athletic Club31 P.A.O.K. Thessaloniki30 Chania Nautical Club26 Panionios G.S.S. (Athens)16 Iraklis Thessaloniki Club16 Kerkyra Nautical Athletic Club14 Volos - Argonaftes Nautical Club13 Kalamaki Nautical Club12 Ydraikos Nautical Club10 Aris Thessaloniki9 O.F. Thalassis Thessaloniki9 Apollon Smyrnis7 Chalcis Nautical Club7 Ilisiakos Athletic Club Athens7 Peristeri Gymnastic Club6 Poseidon Ilision SC (Athens)6 NE Patras Club5 E.N.O. Egyptioton Athens5 A.E.K. Athens4 Larissa Nautical Club3 Argostoli Nautical Club3 Nireas Chalandri Athletic Club3 Mytilene Nautical Club3 G.N.O. Aris Nikaias2 Nireas Lamia Gymnastic Club2 Ilioupolis Gymastic Club (Athens)2 O.Y.K. Volos1 O.F.I. (Heraklion)1 Phoenix Piraeus

Greek clubs in European competitions Club Champions League Euro Cup Cup Winners' Cup (defunct) Super Cup Years Years Years Years Olympiacos Piraeus 2 2002,2018 3 1 – 0 2 1 2002 1 Ethnikos Piraeus 0 0 1 0 0 1 0 0 – NO Vouliagmeni 0 0 1 0 1 2 1 1997 0 1 – Panionios 0 0 0 0 2 2 – – NO Patras – 0 1 0 – –

References

External links Hellenic Swimming Federation koe.org.gr Water Polo League waterpololeague.gr Water Polo League ανδρών, Χρυσή Βίβλος: Ο 14ος διαδοχικός τίτλος του Ολυμπιακού - 2026 (Men's Water Polo League, Golden Book: Olympiacos' 14th consecutive title - 2026) sport24.gr