Voussac (French pronunciation: [vusak]; Occitan: Vosac) is a commune in the Allier department in Auvergne-Rhône-Alpes in central France.

In the Middle Ages, the commune was part of medieval Berry before passing into the modern-day province of Bourbonnais.

Voussac is located on departmental road 46, the old Route national 146, which connects Montmarault to Saint-Pourçain-sur-Sioule.

The commune is bordered by Deux-Chaises to the north, Le Theil to the northeast, Fleuriel to the southeast, Target to the south, and Saint-Marcel-en-Murat to the west.

The Vacheresse Forest occupies a notable portion of the commune's territory, to the south-east of the town.