Országos Bajnokság I (men's water polo)

Országos Bajnokság I (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:

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)

Name changes

 * Budapesti Honvéd SE (Bp. Honvéd): 1949 Budapesti Honvéd SE, 1999 Honvéd-Spartacus, 2000 Honvéd Domino, 2001 Domino-BHSE, 2007 Domino-Honvéd, 2010 Grupama Honvéd, 2013 Racionet Honvéd, 2018 Bp. Honvéd
 * Ferencvárosi TC (FTC): (1904 Ferencvárosi TC, 1950 EDOSZ, 1951 Bp. Kinizsi, 1957 Ferencváros, 1989 FTC-Törley, 1993 Ferencváros, 1994 FTC-Vitasport, 1996 FTC-Vitalin, 1999 FTC-Thomas Jeans, 2000 FTC-Mirato, 2001 FTC-VMAX, 2003 Jégcsillag-FTC, 2004 Betonút-FTC, 2006 FTC-Aprilia, 2008 FTC-Fisher Klíma, 2012 Széchenyi Bank-FTC, 2014 Ferencváros, 2015 FTC-PQS Waterpolo, 2018 FTC-Telekom Waterpolo)
 * Újpesti TE (UTE): 1891 Újpesti TE, 1950 Bp. Dózsa, 1957 Újpesti Dózsa, 1990 Újpest, 1993 UTE-Primavera, 1994 UTE-Office & Home, 1998 UTE-Taxi2000, 1999 UTE-Santal-Taxi2000, 2000 UTE-Humet, 2002 UTE-Taxi2000, 2004 UTE-VB Leasing, 2006 UTE-Óbuda-Újlak, 2007 Uniqa-UTE, 2010 Újpest)

By club

 * The bolded teams are currently playing in the 2021-22 season of the Hungarian League.

Most seasons
The number of seasons that each team (in alphabetical order) has played in the top division from 1904 until 2021–22. A total of 61 teams had competed in at least one season at the top division. Ferencváros is the only teams to have played in the top division in every season since the league's inception in its modern form.


 * 111: Ferencváros
 * 87: Újpest
 * 85: Eger
 * 74: Vasas
 * 71: BVSC, Szolnok
 * 61: Bp. Honvéd
 * 56: OSC
 * 52: Szentes
 * 44: Szeged
 * 42: Bp. Spartacus
 * 38: Tungsram
 * 36: MTK Budapest
 * 31: Tatabánya
 * 24: III. Kerület
 * 23: MAC
 * 20: Nemzeti SC
 * 18: MAFC, KSI
 * 17: Magyar Úszó Egylet
 * 16: Csepel, Pécsi VSK
 * 12: Szegedi Úszó Egylet
 * 11: BEAC, Debrecen
 * 10: Kaposvár
 * 9: BSE
 * 8: BKV Előre, Bp. Vörös Meteor, UVSE
 * 7: Miskolc
 * 5: Hódmezővásárhely, Kecskemét
 * 3: Balatoni Úszó Egylet, Óbuda TE, Vívó és Atlétikai Club, Volán, Cegléd, Neptun VSC, AVUS
 * 2: Gamma SE, BBTE, Erzsébeti TC, Marosvásárhelyi SE, Tipográfia NyTE, Szegedi MTE, Szegedi Dózsa, Szent István University, Fehérvár Póló SE
 * 1: Postatakarékpénztár, Szegedi VSE, Közalkalmazottak SE, Angyalföldi Sportiskola DSE, Eszterházy Károly University, YBL Waterpolo Club

The teams in Bold participate in the 2021–22 OB I.

Format
As we can see from the chart the number of teams in the Hungarian First Division changed a lot and continuously. The league started in 1904 with four teams and with the formation of teams the league expanded continuously. Currently, there are 14 teams in the first division.