The 2020–21 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 115th season of top-tier water polo in Hungary.
The 2020–21 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 115th season of top-tier water polo in Hungary. (en)