Carmaux is a commune in the Tarn department in southern France.
The Compagnie minière de Carmaux has its origins in a coal mining concession granted in 1852 to Gabriel de Solages, which became the Compagnie minière de Carmaux. He also founded a glass bottle factory, fueled by the coal.
Carmaux was famous for its industries of coal mining (from the thirteenth century to 2000) and its glassworks (from the eighteenth century to 1931).
The Cérou flows northwestward through the commune and crosses the town.