The 2017–18 Belgian First Amateur Division was the second season of the third-tier football league in Belgium, as it was established in 2016.
At the bottom side of the table, following the bankruptcy of Lierse (playing in the 2017–18 Belgian First Division B), one less team was forced to be relegated.
As a result, 13th placed Châtelet was saved and did not have to play the 2017–18 Belgian Second Amateur Division Promotion play-offs Final, which was played instead by Hamme who avoided direct relegation.
Hamme in the end could not win the Promotion Final and was relegated after all, together with Berchem Sport and Patro Eisden Maasmechelen who had finished in the bottom two places.
The teams finishing in the top four positions entered the promotion play-offs.