A1 Ethniki Water Polo

A1 Ethniki
Current season, competition or edition:
Current sports event 2023–24 A1 Ethniki
SportWater polo
Founded1927; 97 years ago (1927)
AdministratorHellenic Swimming Federation
No. of teams16
CountryGreece
ConfederationLEN
Most recent
champion(s)
Olympiacos Piraeus
(2023–24)
Most titlesEthnikos Piraeus
Olympiacos Piraeus
(38 titles)
TV partner(s)ERT
Level on pyramidLevel 1
Relegation toA2 Ethniki Water Polo
Domestic cup(s)Greek Cup
International cup(s)LEN Champions League
LEN Euro Cup
Official websitekoe.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.