Guerin, Garin, Warin, or Werner (died 845 or 856) is the Count of Auvergne, Chalon, Mâcon, Autun, Arles and Duke of Provence, Burgundy, and Toulouse.

Guerin stabilizes the region against the Saracens from a base of Marseille and fortifies Chalon-sur-Saône (834).

He takes part in many campaigns during the civil wars that mark the reign of Louis the Pious (814 – 840) and after his death until the Treaty of Verdun (843).

The primary sources for his life are charters and chronicles like the Vita Hludovici.