The canton of Conflans-en-Jarnisy () is a former French canton located in the department of Meurthe-et-Moselle in the Lorraine region (now part of Grand Est). This canton was organized around Conflans-en-Jarnisy in the arrondissement of Briey. It is now part of the canton of Pays de Briey.
The last general councillor from this canton was Olivier Tritz (PCF), elected in 2011.
The canton of Conflans-en-Jarnisy grouped together 25 municipalities and had 19,232 inhabitants (2012 census without double counts).