The 2020–21 Nemzeti Bajnokság I (known as the K&H férfi kézilabda liga for sponsorship reasons) was the 70th season of the Nemzeti Bajnokság I, Hungarian premier Handball league.
After the 2019–20 season, Ceglédi KKSE and Vecsés SE were relegated to the 2019–20 Nemzeti Bajnokság I/B.
They were replaced by two clubs from the 2019–20 Nemzeti Bajnokság I/B; Orosházi FKSE and Váci KSE.
Following is the list of clubs competing in 2020–21 Nemzeti Bajnokság I, with their president, head coach, kit manufacturer and shirt sponsor.
Hungarian national sports betting brand tippmix sponsors all 14 teams of the first league since February 2019, their logo is therefore present on all team kits.