The 2023–24 Nemzeti Bajnokság III is Hungary's third-level football competition.
The following teams have changed division since the 2022–23 season.
In Play-off matches between finished 1st of 4 group respectively will ahead of promotion to Nemzeti Bajnokság II is two teams winner.
Szentlőrinc won 3–1 on aggregate and promoted to NB II, whereas Putnok was remained in NB III.
Tatabánya won 3-4 on aggregate and promoted to NB II, whereas Békéscsaba was remained in NB III but promoted to NB II due to dissolve Haladás.