The 2020–21 Nemzeti Bajnokság I (also known as 2020–21 OTP Bank Liga), also known as NB I, is the 122nd season of top-tier football in Hungary.
The league was officially named OTP Bank Liga for sponsorship reasons.
[1] Debrecen and Kaposvár finished the 2019–20 Nemzeti Bajnokság I in the last two places and thus were relegated to NB II division.
The two relegated teams were replaced with the top two teams in 2019–20 Nemzeti Bajnokság II, champion MTK and runner-up Budafok, each having the required licence for top-division play.
Note: Flags indicate national team as has been defined under FIFA eligibility rules.