# Országos Bajnokság I (men's water polo)

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.

## Current teams

The following 14 clubs compete in the OB I during the 2022–23 season:
| Team | Home city | Pool |
| BVSC | Budapest (XIV. ker) | Szőnyi úti Uszoda |
| Eger | Eger | Bitskey Aladár Uszoda |
| Ferencváros | Budapest (IX. ker) | FTC uszoda, Népliget |
| Bp. Honvéd | Budapest (XIX. ker) | Kőér utcai Uszoda |
| Kaposvár | Kaposvár | Csík Ferenc Sportuszoda |
| KSI | Budapest | Széchy Tamás Uszoda |
| Miskolc | Miskolc | Kemény Dénes Sportuszoda |
| OSC | Budapest (XI. ker) | Nyéki Imre Uszoda |
| PVSK | Pécs | Abay Nemes Oszkár Sportuszoda |
| Szeged | Szeged | Tiszavirág Sportuszoda |
| Szentes | Szentes | Dr. Rébeli Szabó József Sportuszoda |
| Szolnok | Szolnok | Tiszaligeti Uszoda |
| UVSE | Budapest (IV. ker) | Komjádi Béla Sportuszoda |
| Vasas | Budapest (XIII. ker) | Komjádi Béla Sportuszoda |

## Previous winners

* 1904: Balaton
* 1905: Balaton (2)
* 1906: Magyar Úszó Egylet
* 1907: Magyar Úszó Egylet (2)
* 1908: Magyar Úszó Egylet (3)
* 1909: Magyar Úszó Egylet (4)
* 1910: Ferencváros
* 1911: Ferencváros (2)
* 1912: Ferencváros (3)
* 1913: Ferencváros (4)
* 1914-16 – Not held due to WW I
* 1917: MAFC
* 1918: Ferencváros (5)
* 1919: Ferencváros (6)
* 1920: Ferencváros (7)
* 1921: Ferencváros (8)
* 1922: Ferencváros (9)
* 1923: III. Kerület
* 1924: III. Kerület (2)
* 1925: Ferencváros (10)
* 1926: Ferencváros (11)
* 1927: Ferencváros (12)
* 1928: III. Kerület (3)
* 1929: MAC
* 1930: Újpest
* 1931: Újpest (2)
* 1932: Újpest (3)
* 1933: Újpest (4)
* 1934: Újpest (5)
* 1935: Újpest (6)
* 1936: Újpest (7)
* 1937: Újpest (8)
* 1938: Újpest (9)
* 1939: Újpest (10)
* 1940: BSE
* 1941: Újpest (11)
* 1942: Újpest (12)
* 1943: MAC (2)
* 1944: Ferencváros (13)
* 1945: Újpest (13)
* 1946: Újpest (14)
* 1947: Vasas
* 1948: Újpest (15)
* 1949: Vasas (2)
* 1950: Újpest (16)
* 1951: Újpest (17)
* 1952: Újpest (18)
* 1953: Vasas (3)
* 1954: Szolnok
* 1955: Újpest (19)
* 1956: Ferencváros (14)
* 1957: Szolnok (2)
* 1958: Szolnok (3)
* 1959: Szolnok (4)
* 1960: Újpest (20)
* 1961: Szolnok (5)
* 1962: Ferencváros (15)
* 1963: Ferencváros (16)
* 1964: Szolnok (6)
* 1965: Ferencváros (17)
* 1966: BVSC
* 1967: Újpest (21)
* 1968: Ferencváros (18)
* 1969: OSC
* 1970: OSC (2)
* 1971: OSC (3)
* 1972: OSC (4)
* 1973: OSC (5)
* 1974: OSC (6)
* 1975: Vasas (4)
* 1976: Vasas (5)
* 1977: Vasas (6)
* 1978: OSC (7)
* 1979: Vasas (7)
* 1980: Vasas (8)
* 1981: Vasas (9)
* 1982: Vasas (10)
* 1983: Vasas (11)
* 1984: Vasas (12)
* 1984/85: BVSC (2)
* 1985/86: Újpest (22)
* 1986/87: BVSC (3)
* 1987/88: Ferencváros (19)
* 1988/89: Vasas (13)
* 1989/90: Ferencváros (20)
* 1990/91: Újpest (23)
* 1991/92: Tungsram
* 1992/93: Újpest (24)
* 1993/94: Újpest (25)
* 1994/95: Újpest (26)
* 1995/96: BVSC (4)
* 1996/97: BVSC (5)
* 1997/98: BVSC (6)
* 1998/99: BVSC (7)
* 1999/00: Ferencváros (21)
* 2000/01: Bp. Honvéd
* 2001/02: Bp. Honvéd (2)
* 2002/03: Bp. Honvéd (3)
* 2003/04: Bp. Honvéd (4)
* 2004/05: Bp. Honvéd (5)
* 2005/06: Bp. Honvéd (6)
* 2006/07: Vasas (14)
* 2007/08: Vasas (15)
* 2008/09: Vasas (16)
* 2009/10: Vasas (17)
* 2010/11: Eger
* 2011/12: Vasas (18)
* 2012/13: Eger (2)
* 2013/14: Eger (3)
* 2014/15: Szolnok (7)
* 2015/16: Szolnok (8)
* 2016/17: Szolnok (9)
* 2017/18: Ferencváros (22)
* 2018/19: Ferencváros (23)
* 2019/20 – Canceled due to COVID-19 pandemic
* 2020/21: Szolnok (10)
* 2021/22: Ferencváros (24)
* 2022/23: Ferencváros (25)
* 2023/24: Ferencváros (26)