Achard of Saint-Victor was a 12th-century theologian and bishop who served as the abbot of the Abbey of Saint-Victor in Paris. Born in England, he was educated in France and eventually became the Bishop of Avranches in 1161. He was a prominent figure in the religious life of both France and England, maintaining cordial relations with King Henry II and demonstrating a steadfast friendship with Thomas Becket. He is remembered as a blessed figure by the Canons Regular of Saint Augustine.