William XII of Auvergne

William XII (c. 1300–6 August 1332) succeeded his father Robert VII as count of Auvergne and Boulogne in 1325. His mother was Blanche of Clermont, daughter of the Capetian prince Robert, count of Clermont. In 1325 he married Margaret of Évreux, daughter of Louis, count of Évreux.

William died on 6 August 1332, leaving a single child, Joan, who succeeded as countess of Auvergne and Boulogne and later became queen of France through her marriage to John II.