William VI, Count of Auvergne

William VI (c. 1069–1136) succeeded his father Robert II as count of Auvergne. He joined the First Crusade and in 1102 led Auvergne's nobles to the Holy Land, besieging Tripoli with Raymond of Saint-Gilles. He founded the fortified town of Montferrand to overawe the bishop's city of Clermont.

His attacks on the Clermont clergy brought Louis VI's army south in 1122, forcing him to return what he had seized. In 1126 the king besieged Montferrand until the Duke of Aquitaine, William's overlord, intervened. By Emma of Sicily, his sons were Robert III and William VIII, both later counts.