Commentry (French pronunciation: [kɔmɑ̃tʁi]; Auvergnat: Comentriac) is a commune in the department of Allier in central France.

Commentry was home to Compagnie de Commentry-Fourchambault-Decazeville, thanks to an important coal deposit.

The coal mine fueled a huge growth in population, from under 1,000 to more than 12,000, while Stéphane Mony was its CEO (1840–1884).

Commentry gave its name to a coal field over 21 square kilometres in extent, and historically had important foundries and forges.

[7] Charles Brongniart discovered many fossils near Commentry, including Meganeura in the Stephanian stage coal measures in 1880.