The canton of Saint-Chamond-Sud is a French former administrative division located in the department of Loire and the Rhone-Alpes region. It was disbanded following the French canton reorganisation which came into effect in March 2015. It had the following communes:|- | Saint-Chamond || align="right" | (1)|| align="right" | 42400 || align="right" | 42207 |- | La Valla-en-Gier || align="right" | 741 || align="right" | 42131 || align="right" | 42322 |} (1) part of commune.