The 2018–19 Nemzeti Bajnokság I (known as the K&H női kézilabda liga for sponsorship reasons) is the 68th season of the Nemzeti Bajnokság I, Hungarian premier Handball league.
After the 2017–18 season, Kecskeméti NKSE and Vasas SC were relegated to the 2018–19 Nemzeti Bajnokság I/B.
They were replaced by two clubs from the 2017–18 Nemzeti Bajnokság I/B; Eszterházy SC and Mosonmagyaróvári KC SE.
Following is the list of clubs competing in 2018–19 Nemzeti Bajnokság I, with their president, head coach, kit manufacturer and shirt sponsor.
Source: League matches: NB I 2018/2019 Attendance numbers without playoff matches.