A1 Ethniki Water Polo

{{Short description|Water polo league in Greece}}

{{Infobox Sports league

| title = A1 Ethniki

| current_season = 2024–25 A1 Ethniki

| logo = A1 Ethniki.svg

| pixels = 260px

| sport = Water polo

| founded = {{Start date and age|1927}}

| relegation = A2 Ethniki Water Polo

| administrator = Hellenic Swimming Federation

| teams = 16

| level = Level 1

| country = Greece

| continent = Europe

| confed = LEN

| champion = Olympiacos Piraeus

| champ_season = 2024–25

| most_champs = Olympiacos Piraeus

(39 titles)

| domestic_cup = Greek Cup

| confed_cup = LEN Champions League
LEN Euro Cup

| TV = ERT

| website = [https://koe.org.gr/ koe.org.gr]

}}

The A1 Ethniki ({{langx|el|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.

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

History

= Title holders =

{{div col|colwidth=18em}}

{{div col end}}

Titles by club

class="wikitable"
No.

! Club

! Winners

! Winning years

1.

| File:630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus

| style="text-align:center" | 39

| 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

style="text-align:center" | 2.

| width="145" | 25x25px Ethnikos Piraeus

| style="text-align:center" | 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

style="text-align:center"| 3.

| File:600px Bianco con striscia Blu centrale.svg NO Patras

|style="text-align:center"| 8

| 1935, 1937, 1938, 1939, 1940, 1945, 1946, 1950

style="text-align:center"| 4.

| File:Giallo_e_Nero_Aris.JPG Aris Thessaloniki

|style="text-align:center"| 4

| 1928, 1929, 1930, 1932

style="text-align:center"| 5.

| File:600px_Blu_e_Bianco_dolphin.png ANO Glyfada

|style="text-align:center"| 4

| 1986, 1987, 1989, 1990

style="text-align:center"| 6.

| File:600px_Bianco_Blu_e_Rosso_diagonale_con_ancora_Dorata.png NO Vouliagmeni

|style="text-align:center"| 4

| 1991,1997, 1998, 2012

style="text-align:center"| 7.

| File:600px chequered Blue HEX-002D68 HEX-619EFB.svg Peiraikos

|style="text-align:center"| 1

| 1923

* The 1969 Championship was shared between Olympiacos and Ethnikos

Consecutive championships

Appearances in A' Ethniki (1967―2025)

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 2024–25 season.

valign="top" width=33% |

{| class=wikitable style="text-align: left; font-size:100%"

{{Tooltip|App|Appearances}}

! width="240" | Club

style="text-align:center;" |59

| 22px Olympiacos S.F. Piraeus

style="text-align:center;" |57

| 22px Ethnikos O.F. Piraeus

style="text-align:center;" |50

| 22px Chios Nautical Club

style="text-align:center;" |47

| 22px Panathinaikos Athens

style="text-align:center;" |46

| 25px NO Patras

style="text-align:center;" |45

| File:600px Bianco Blu e Rosso diagonale con ancora Dorata.png Vouliagmeni Nautical Club

style="text-align:center;" |45

| 22px Glyfada Athletic Nautical Club

style="text-align:center;" |37

| 22px Palaio Faliro Athletic Club

style="text-align:center;" |30

| 22px P.A.O.K. Thessaloniki

style="text-align:center;" |29

| 22px Chania Nautical Club

style="text-align:center;" |25

| 22px Panionios G.S.S. (Athens)

style="text-align:center;" |16

| 22px Iraklis Thessaloniki

| valign="top" width=33% |

class=wikitable style="text-align: left; font-size:100%"
{{Tooltip|App|Appearances}}

! width="240" | Club

style="text-align:center;" |16

| 22px Kerkyra Nautical Athletic Club

style="text-align:center;" |14

| 22px Volos - Argonaftes Nautical Club

style="text-align:center;" |13

| |22px Kalamaki Nautical Club

style="text-align:center;" |11

| 22px Ydraikos Nautical Club

style="text-align:center;" |10

| 22px Aris Thessaloniki

style="text-align:center;" |8

| 22px O.F. Thalassis Thessaloniki

style="text-align:center;" |8

| 22px Apollon Smyrnis

style="text-align:center;" |7

| 22px Chalcis Nautical Club

style="text-align:center;" |7

| 22px Ilisiakos Athletic Club Athens

style="text-align:center;" |6

| 22px Poseidon Ilision SC (Athens)

style="text-align:center;" |6

| 22px NE Patras

style="text-align:center;" |6

| 22px Peristeri Gymnastic Club

| valign="top" width=33% |

class=wikitable style="text-align: left; font-size:100%"
{{Tooltip|App|Appearances}}

! width="240" | Club

style="text-align:center;" |5

| 22px E.N.O. Egyptioton Athens

style="text-align:center;" |5

| 22px A.E.K. Athens

style="text-align:center;" |3

| 22px Argostoli Nautical Club

style="text-align:center;" |3

| 22px Nireas Chalandri Athletic Club

style="text-align:center;" |3

| 22px Mytilene Nautical Club

style="text-align:center;" |3

| 22px G.N.O. Aris Nikaias

style="text-align:center;" |3

| 22px Larissa Nautical Club

style="text-align:center;" |2

| 22px Nireas Lamia Gymnastic Club

style="text-align:center;" |2

| 22px Ilioupolis Gymastic Club (Athens)

style="text-align:center;" |2

| 22px O.Y.K. Volos

style="text-align:center;" |1

| 22px O.F.I. (Heraklion)

style="text-align:center;" |1

| 22px Phoenix Piraeus

|}

Greek clubs in European competitions

class="wikitable" style="text-align:center"
width=165; rowspan=2|Clubrowspan=7|style="font-size:90%"; colspan=4|Champions Leaguerowspan=7|style="font-size:90%"; colspan=4|Euro Cuprowspan=7|style="font-size:90%"; colspan=4|Cup Winners' Cup (defunct)rowspan=7|style="font-size:90%"; colspan=3|Super Cup
width=45|{{Tooltip|C|Champion}}width=45|Yearswidth=35|{{Tooltip|RU|Runner-up}}width=30|{{Tooltip|SF|Semi-finalist}}width=40|{{Tooltip|C|Champion}}width=45|Yearswidth=30|{{Tooltip|RU|Runner-up}}width=25|{{Tooltip|SF|Semi-finalist}}width=40|{{Tooltip|C|Champion}}width=45|Yearswidth=30|{{Tooltip|RU|Runner-up}}width=25|{{Tooltip|SF|Semi-finalist}}width=40|{{Tooltip|C|Champion}}width=45|Yearswidth=30|{{Tooltip|RU|Runner-up}}
align=left|File:630px_seven_vertical_stripes_HEX-ED1C24_and_White.svg Olympiacos Piraeus2align=center|2002,201831colspan=4| –0align=center|2align=center|1align=center|20021
align=left| 25x25px Ethnikos Piraeus0align=center|010align=center|010align=center|0align=center|colspan=3| –
align=left| File:600px_Bianco_Blu_e_Rosso_diagonale_con_ancora_Dorata.png NO Vouliagmeni0align=center|010align=center|121align=center|199701colspan=3| –
align=left| File:Rosso_e_Blu_(Diagonale).png Panionios0align=center|000align=center|22colspan="4" | –colspan=3| –
align=left| File:600px Bianco con striscia Blu centrale.svg NO Patrascolspan="4" | –0align=center|10colspan=4| –colspan=3| –

References

{{reflist}}