Decazeville (Occitan: La Sala) is a commune in the Aveyron department in the Occitanie region in southern France.

In 1826 he created, with the help of a technician named Cabrol, the "Houillères et Fonderies de l'Aveyron" (Mines and Foundries of Aveyron) which developed to make this small village a center of ironworking and industry.

The high point of iron production was reached early in the 20th century, when some 9000 employees produced 1 million tons of steel.

Although Decazeville felt the full brunt of the decline in the mining industry, the town has diversified its economy.

The modern church of Notre-Dame has a celebrated painting of the Way of the Cross by Gustave Moreau.