A1 Ethniki Water Polo

The A1 Ethniki (Α1 Εθνική Κατηγορία), 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.

Ethnikos Piraeus and Olympiacos Piraeus share the most championships, having 38. 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 600px chequered Blue HEX-002D68 HEX-619EFB.svg Peiraikos
 * 1925–26 Five_blue_four_white_striped_flag.png Ethnikos Piraeus
 * 1926–27 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus
 * 1927–28 Giallo_e_Nero_Aris.JPG Aris Thessaloniki
 * 1928–29 Giallo_e_Nero_Aris.JPG Aris Thessaloniki (2)
 * 1929–30 Giallo_e_Nero_Aris.JPG Aris Thessaloniki (3)
 * 1930–31 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (2)
 * 1931–32 Giallo_e_Nero_Aris.JPG Aris Thessaloniki (4)
 * 1932–33 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (2)
 * 1933–34 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (3)
 * 1934–35 600px Bianco con striscia Blu centrale.svg NO Patras
 * 1935–36 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (4)
 * 1936–37 600px Bianco con striscia Blu centrale.svg NO Patras (2)
 * 1937–38 600px Bianco con striscia Blu centrale.svg NO Patras (3)
 * 1938–39 600px Bianco con striscia Blu centrale.svg NO Patras (4)
 * 1939–40 600px Bianco con striscia Blu centrale.svg NO Patras (5)
 * 1941–44 Not held due to WW II
 * 1944–45 600px Bianco con striscia Blu centrale.svg NO Patras (6)
 * 1945–46 600px Bianco con striscia Blu centrale.svg NO Patras (7)
 * 1946–47 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Pireaus (5)
 * 1947–48 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (3)
 * 1948–49 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (6)
 * 1949–50 600px Bianco con striscia Blu centrale.svg NO Patras (8)
 * 1950–51 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (7)
 * 1951–52 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (8)
 * 1952–53 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (4)
 * 1953–54 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (5)
 * 1954–55 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (6)
 * 1955–56 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (7)
 * 1956–57 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (8)
 * 1957–58 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (9)
 * 1958–59 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (10)
 * 1959–60 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (11)
 * 1960–61 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (12)
 * 1961–62 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (13)
 * 1962–63 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (14)
 * 1963–64 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (15)
 * 1964–65 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (16)
 * 1965–66 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (17)
 * 1966–67 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (18)
 * 1967–68 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (19)
 * 1968–69 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (20) & 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (9)
 * 1969–70 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (21)
 * 1970–71 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (10)
 * 1971–72 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (22)
 * 1972–73 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (23)
 * 1973–74 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (24)
 * 1974–75 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (25)
 * 1975–76 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (26)
 * 1976–77 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (27)
 * 1977–78 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (28)
 * 1978–79 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (29)
 * 1979–80 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (30)
 * 1980–81 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (31)
 * 1981–82 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (32)
 * 1982–83 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (33)
 * 1983–84 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (34)
 * 1984–85 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (35)
 * 1985–86 600px_Blu_e_Bianco_dolphin.png ANO Glyfada
 * 1986–87 600px_Blu_e_Bianco_dolphin.png ANO Glyfada (2)
 * 1987–88 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (36)
 * 1988–89 600px_Blu_e_Bianco_dolphin.png ANO Glyfada (3)
 * 1989–90 600px_Blu_e_Bianco_dolphin.png ANO Glyfada (4)
 * 1990–91 600px_Bianco_Blu_e_Rosso_diagonale_con_ancora_Dorata.png NO Vouliagmeni
 * 1991–92 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (11)
 * 1992–93 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (12)
 * 1993–94 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (37)
 * 1994–95 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (13)
 * 1995–96 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (14)
 * 1996–97 600px_Bianco_Blu_e_Rosso_diagonale_con_ancora_Dorata.png NO Vouliagmeni (2)
 * 1997–98 600px_Bianco_Blu_e_Rosso_diagonale_con_ancora_Dorata.png NO Vouliagmeni (3)
 * 1998–99 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (15)
 * 1999–00 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (16)
 * 2000–01 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (17)
 * 2001–02 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (18)
 * 2002–03 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (19)
 * 2003–04 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (20)
 * 2004–05 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (21)
 * 2005–06 Five_blue_four_white_striped_flag.png Ethnikos Piraeus (38)
 * 2006–07 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (22)
 * 2007–08 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (23)
 * 2008–09 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (24)
 * 2009–10 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (25)
 * 2010–11 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (26)
 * 2011–12 600px_Bianco_Blu_e_Rosso_diagonale_con_ancora_Dorata.png NO Vouliagmeni (4)
 * 2012–13 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (27)
 * 2013–14 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (28)
 * 2014–15 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (29)
 * 2015–16 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (30)
 * 2016–17 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (31)
 * 2017–18 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (32)
 * 2018–19 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (33)
 * 2019–20 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (34)
 * 2020–21 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (35)
 * 2021–22 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (36)
 * 2022–23 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (37)
 * 2023–24 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus (38)

Titles by club
* The 1969 Championship was shared between Olympiacos and Ethnikos

Consecutive championships
18 in a row
 * Five_blue_four_white_striped_flag.png Ethnikos Piraeus→1953–1970

14 in a row
 * Five_blue_four_white_striped_flag.png Ethnikos Piraeus→1972-1985

12 in a row
 * 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus→2013–2024

9 in a row
 * 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus→1999–2005

6 in a row
 * 600px Bianco con striscia Blu centrale.svg NO Patras→1937–1946

5 in a row
 * 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus→2007–2011

3 in a row
 * Giallo_e_Nero_Aris.JPG Aris Thessaloniki→1928–1930

2 in a row
 * 630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos→1933–1934, 1951–1952, 1992–1993, 1995–1996


 * 600px_Blu_e_Bianco_dolphin.png ANO Glyfada→1986–1987, 1989–1990


 * 600px_Bianco_Blu_e_Rosso_diagonale_con_ancora_Dorata.png NO Vouliagmeni→1997–1998

Appearances in A' Ethniki (1967―2024)
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 2023–24 season.