The 2018–19 Championnat National 3 is the second season of the fifth tier in the French football league system in its current format.
[2] Reserve teams whose training centre is categorised as category 2B or lower cannot be promoted to Championnat National 2 by the rules of the competition.
It was announced in September 2018 that the following reserve teams would be ineligible for promotion following the categorisation of their training centres: AC Ajaccio, Amiens SC, Brest, Clermont, Dijon and Paris FC.
On 12 June 2019, the financial regulator of the FFF, the DNCG denied Mulhouse promotion, subject to appeal.
Pau (res), Cestas, Montmorillon, Chauray, Laval (res), La Suze, Amilly, Saint-Jean-le-Blanc, Cannet, Le Pontet, ÉF Bastia, AS Saint-Rémy, La Charité, Avallon, Grandvillars, Sarreguemines, Nancy (res), Épernay, Agde, Lozère, Tarbes, Senlis, Dunkerque (res), Tourcoing, Chantilly, ASPTT Caen, Bayeux, Déville-Maromme, Montagnarde, Atlantique Vilaine, Brétigny, Le Mée, Meaux Academy, Noisy-le-Sec, Moulins and Ytrac finished in the relegation places and were relegated to the top division of their respective regional leagues, subject to any reprieves detailed in the next section.