The 2019–20 Belgian Third Amateur Division was the fourth season of the division in its current format.
Mid-March all matches were temporarily postponed due to the COVID-19 pandemic in Belgium, only to be canceled permanently two weeks later, with the standing as of March 12 counting as final.
As a result, Knokke, Tienen and Francs Borains were crowned champions in their respective league and were each promoted to the 2020–21 Belgian Second Amateur Division.