Országos Bajnokság I (men's water polo)

Országos Bajnokság I
SportWater Polo
Founded1904 (1904)
No. of teams14
CountryHungary
ConfederationLEN (Europe)
Most recent
champion
Ferencváros (27th title)
(2024–25)
Most titlesFerencváros (27 titles)
BroadcasterM4 Sport
Relegation toOrszágos Bajnokság I/B
Domestic cupMagyar Kupa
International cupsLEN Champions League
LEN Euro Cup
Official websitewaterpolo.hu

Országos Bajnokság I (English: Nationwide Championship I, commonly abbreviated OB I) is the highest level water polo league for men in Hungary, that is administered and supervised by the Hungarian Water Polo Federation. Since 2009, after signed a four-year sponsorship contract with telecommunications company Vodafone, the competition is officially known as Vodafone OB I.