The canton of Portet-sur-Garonne is an administrative division of the Haute-Garonne department, southern France. Its borders were modified at the French canton reorganisation which came into effect in March 2015. Its seat is in Portet-sur-Garonne.
It consists of the following communes:
Coordinates: 43°32′N 1°24′E / 43.53°N 1.40°E