The canton of Bar-le-Duc-Sud () is a former French canton located in the department of Meuse in the Lorraine region (now part of Grand Est). It is now part of the canton of Bar-le-Duc-1 and canton of Bar-le-Duc-2.
The last general councillor from this canton was Diana André (PS), elected in 2008.
The canton of Bar-le-Duc-Sud was made up of a fraction of the commune of Bar-le-Duc and 4 other communes and had 10,044 inhabitants (2012 census without double counts).