Montluçon is a commune in central France on the river Cher. It is the largest commune in the Allier department, although the department's prefecture is located in the smaller town of Moulins. Its inhabitants are known as Montluçonnais. The town is in the traditional province of Bourbonnais and was part of the mediaeval duchy of Bourbon.

Allier is a department in the Auvergne-Rhône-Alpes region that borders Cher to the west, Nièvre to the north, Saône-et-Loire and Loire to the east, Puy-de-Dôme to the south, and Creuse to the south-west. Named after the river Allier, it had a population of 334,872 in 2021. Moulins is the prefecture; Montluçon and Vichy are the subprefectures. Its INSEE and post code is 03.