A1 Ethniki Water Polo
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.
History
- 1926-27: Panhelladiko Championship
- 1927-28 to 1965-66: Panhellenic Championship
- 1966-67 to 1985-86: A Ethniki
- 1986-87 to present: A1 Ethniki
Title holders
- 1922–23 Peiraikos
- 1925–26 Ethnikos Piraeus
- 1926–27 Olympiacos
- 1927–28 Aris
- 1928–29 Aris
- 1929–30 Aris
- 1930–31 Ethnikos Piraeus
- 1931–32 Aris
- 1932–33 Olympiacos
- 1933–34 Olympiacos
- 1934–35 NOP
- 1935–36 Olympiacos
- 1936–37 NOP
- 1937–38 NOP
- 1938–39 NOP
- 1939–40 NOP
- 1941–44 Not held due to WW II
- 1944–45 NOP
- 1945–46 NOP
- 1946–47 Olympiacos
- 1947–48 Ethnikos Piraeus
- 1948–49 Olympiacos
- 1949–50 NOP
- 1950–51 Olympiacos
- 1951–52 Olympiacos
- 1952–53 Ethnikos Piraeus
- 1953–54 Ethnikos Piraeus
- 1954–55 Ethnikos Piraeus
- 1955–56 Ethnikos Piraeus
- 1956–57 Ethnikos Piraeus
- 1957–58 Ethnikos Piraeus
- 1958–59 Ethnikos Piraeus
- 1959–60 Ethnikos Piraeus
- 1960–61 Ethnikos Piraeus
- 1961–62 Ethnikos Piraeus
- 1962–63 Ethnikos Piraeus
- 1963–64 Ethnikos Piraeus
- 1964–65 Ethnikos Piraeus
- 1965–66 Ethnikos Piraeus
- 1966–67 Ethnikos Piraeus
- 1967–68 Ethnikos Piraeus
- 1968–69 Ethnikos Piraeus & Olympiacos
- 1969–70 Ethnikos Piraeus
- 1970–71 Olympiacos
- 1971–72 Ethnikos Piraeus
- 1972–73 Ethnikos Piraeus
- 1973–74 Ethnikos Piraeus
- 1974–75 Ethnikos Piraeus
- 1975–76 Ethnikos Piraeus
- 1976–77 Ethnikos Piraeus
- 1977–78 Ethnikos Piraeus
- 1978–79 Ethnikos Piraeus
- 1979–80 Ethnikos Piraeus
- 1980–81 Ethnikos Piraeus
- 1981–82 Ethnikos Piraeus
- 1982–83 Ethnikos Piraeus
- 1983–84 Ethnikos Piraeus
- 1984–85 Ethnikos Piraeus
- 1985–86 Glyfada
- 1986–87 Glyfada
- 1987–88 Ethnikos Piraeus
- 1988–89 Glyfada
- 1989–90 Glyfada
- 1990–91 Vouliagmeni
- 1991–92 Olympiacos
- 1992–93 Olympiacos
- 1993–94 Ethnikos Piraeus
- 1994–95 Olympiacos
- 1995–96 Olympiacos
- 1996–97 Vouliagmeni
- 1997–98 Vouliagmeni
- 1998–99 Olympiacos
- 1999–00 Olympiacos
- 2000–01 Olympiacos
- 2001–02 Olympiacos
- 2002–03 Olympiacos
- 2003–04 Olympiacos
- 2004–05 Olympiacos
- 2005–06 Ethnikos Piraeus
- 2006–07 Olympiacos
- 2007–08 Olympiacos
- 2008–09 Olympiacos
- 2009–10 Olympiacos
- 2010–11 Olympiacos
- 2011–12 Vouliagmeni
- 2012–13 Olympiacos
- 2013–14 Olympiacos
- 2014–15 Olympiacos
- 2015–16 Olympiacos
- 2016–17 Olympiacos
- 2017–18 Olympiacos
- 2018–19 Olympiacos
- 2019–20 Olympiacos
Titles by club
| No. | Club | Winners | Winning years |
| 1. | 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 |
| 2. | Olympiacos | 34 | 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 |
| 3. | NOP | 8 | 1935, 1937, 1938, 1939, 1940, 1945, 1946, 1950 |
| 4. | Aris | 4 | 1928, 1929, 1930, 1932 |
| 5. | Glyfada | 4 | 1986, 1987, 1989, 1990 |
| 6. | Vouliagmeni | 4 | 1991, 1997, 1998, 2012 |
| 7. | Peiraikos | 1 | 1923 |
- The bolded teams are currently playing in the 2014-15 season of the Greek League.
Greek clubs in European competitions
| Team | Winner | Runners-up |
| Olympiacos | 2002 | 2018 |