John III of Auvergne (1467 – 28 March 1501), Count of Auvergne, Count of Boulogne, Count de Lauraguais, was the son of Bertrand VI, Count of Auvergne and Louise de La Trémoille (1432 – 10 April 1474), Dame de Boussac, the daughter of Georges de la Trémoille. He was the last in the line of Counts of Auvergne and Boulogne from the La Tour d'Auvergne family. After his death Boulogne-sur-Mer was integrated into the royal domain.