2021–22 Országos Bajnokság I (men's water polo)

The 2021–22 Országos Bajnokság I (also known as the E.ON Férfi OB I Bajnokság for sponsorship reasons, OB I in short), is going to be the 116th season of top-tier water polo in Hungary. A total of fourteen teams contest this season's league, which began on 8 September 2021 and will conclude on 18 May 2022.

FTC-Telekom won their twenty-fourth title.

Teams
The following 14 clubs compete in the OB I during the 2021–22 season:

Schedule and results
In the table below the home teams are listed on the left and the away teams along the top.

Semi-finals

 * FTC Telekom v A-Híd VasasPlaket

FTC Telekom won the series 7–1 with points ratio, and advanced to the Finals.


 * Szolnoki Dózsa v Genesys OSC-Újbuda

Genesys OSC-Újbuda won the series 7–1 with points ratio, and advanced to the Finals.

Finals
The Finals series were played best-of-three format, with the higher seeded team playing the first and third (if it was necessary) game at home.


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 * Game 1


 * Game 2

FTC-Telekom Waterpolo won the Final series 2–0.

Third place series
The Third place series were played best-of-three format, with the higher seeded team playing the first and third (if it was necessary) game at home.


 * }


 * Game 1


 * Game 2

A-Híd VasasPlaket won the Third place series 2–0.

Promotion/relegation play-offs
The Promotion/relegation play-offs series were played best-of-three format, with the higher seeded team (13th placed in OB I regular season) playing the first and third (if it was necessary) game at home.

Metalcom Szentes won the 2–0 on series and therefore both clubs remain in their respective leagues.
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Final standings
Sources: MVLSZ (C) Champion; (O) Play-off winner; (R) Relegated