The Belgian Third Division A was one of the two leagues at the third level of the Belgian football league system, the other one being the Belgian Third Division B. This division existed from the 1952–53 to 2015–16 seasons and was played every year with 18 clubs from 2009. Prior to this, the third level in the Belgian football league system was called Promotion and was divided into four leagues of 16 clubs each and prior to the 1931–32 season, the Promotion was divided into three leagues. Due to restructuring, the Third Division was replaced by Belgian Second Amateur Division which plays as three leagues of 16 clubs each from the 2016–17 season.
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The final clubs
^ — R. ES Acrenoise won the Belgian Promotion play-off; admitted to replace defunct R.A.E.C. Mons
^ — SK Sint-Niklaas promoted via the Belgian Promotion play-off