Vedast or Vedastus, also known as Saint Vaast (in Flemish, Norman and Picard) or Saint Waast (also in Picard and Walloon), Saint Gaston in French, and Foster in English (died c. 540) was an early bishop in the Frankish realm. After the victory of Tolbiac Vedast helped instruct the Frankish king Clovis in the Christian faith of his wife, Queen Clotilde. Opinions differ as to whether Remigius, bishop of Reims, entrusted the diocese of Arras and diocese of Cambrai to Vedast as is traditionally held, or if Vedast was more an itinerant bishop without a specific see.