The 2023–24 Belgian National Division 1 was the eighth season of the third-tier football league.
The league began on 30 August 2023 and ended on 12 May 2024.
This was the final season in the league's current format and from the following season, it split into a Flemish (VV) and Francophone (ACFF) division.
Six teams moved to another level: Four teams entered the division, three teams were promoted from the 2022–23 Belgian Division 2: finally, The league was reduced from 20 to 18 teams, resulting in a regular season of 34 matches.
For this season only, no playoffs will be organized, as the league will split into a Flemish (VV) and Francophone (ACFF) division, with 16 and 12 teams respectively.