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A1 Ethniki
Current season, competition or edition:; 2023–24 A1 Ethniki
Sport	Water polo
Founded	1927; 98 years ago
Administrator	Hellenic Swimming Federation
No. of teams	16
Country	Greece
Confederation	LEN
Most recent; champion(s)	Olympiacos Piraeus ; (2023–24)
Most titles	Ethnikos Piraeus ; Olympiacos Piraeus ; (38 titles)
TV partner(s)	ERT
Level on pyramid	Level 1
Relegation to	A2 Ethniki Water Polo
Domestic cup(s)	Greek Cup
International cup(s)	LEN Champions League; LEN Euro Cup
Official website	koe.org.gr

The A1 Ethniki (Greek: 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 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)^[1]
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)

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
1.	Olympiacos Piraeus	38	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
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

12 in a row

Olympiacos Piraeus→2013–2024

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―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.

App	Club
58	Olympiacos S.F. Piraeus
56	Ethnikos O.F. Piraeus
49	Chios Nautical Club
46	Panathinaikos Athens
45	Patras Nautical Club
44	Vouliagmeni Nautical Club
44	Glyfada Athletic Nautical Club
36	Palaio Faliro Athletic Club
29	Chania Nautical Club
29	P.A.O.K. Thessaloniki
24	Panionios G.S.S. (Athens)
16	Iraklis Thessaloniki

App	Club
16	Kerkyra Nautical Athletic Club
14	Volos - Argonaftes Nautical Club
13	Kalamaki Nautical Club
10	Aris Thessaloniki
10	Ydraikos Nautical Club
8	O.F. Thalassis Thessaloniki
7	Chalcis Nautical Club
7	Ilisiakos Athletic Club Athens
7	Apollon Smyrnis
6	Poseidon Ilision SC (Athens)
5	Patras Nautical Union
5	E.N.O. Egyptioton Athens

App	Club
5	Peristeri Gymnastic Club
4	A.E.K. Athens
3	Argostoli Nautical Club
3	Nireas Chalandri Athletic Club
3	Mytilene Nautical Club
3	G.N.O. Aris Nikaias
2	Larissa Nautical Club
2	Nireas Lamia Gymnastic Club
2	Ilioupolis Gymastic Club (Athens)
2	O.Y.K. Volos
1	O.F.I. (Heraklion)
1	Phoenix Piraeus

Greek clubs in European competitions

Club	Champions League				Euro Cup				Cup Winners' Cup (defunct)				Super Cup
Club	C	Years	RU	SF	C	Years	RU	SF	C	Years	RU	SF	C	Years	RU
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	–				–