[1] On 26 June 2017, it was announced that the Hungarian Football Federation did not accept the of Szigetszentmiklósi TK.
[3] On 28 March 2018, the STC Salgótarján announced its withdrawal from the 2017–18 Nemzeti Bajnokság III season.
[4] The results for STC Salgótarján were deleted for the entire season due to their withdrawal.
[5] Updated to games played on 3 June 2018[10] Promoted: Taksony, Méhkeréki SE and Sényő qualified on slots.
The following champions did not assume the Nemzeti Bajnokság III, although they won their county championships: Tolna, Algyő and Pécsvárad