The Fourth Council of Toledo was held in 633. It was convened by Visigothic king Sisenand and took place at the church of Saint Leocadia in Toledo.
Probably under the presidency of the noted Isidore of Seville, the council regulated many matters of discipline, decreed uniformity of liturgy throughout the Visigothic kingdom and took stringent measures against baptized Jews who had relapsed into their former faith. At this council, begun 5 December 633, all the bishops of Hispania were in attendance. Isidore, though elderly, presided over its deliberations, and was the originator of most of its enactments. The council probably expressed with tolerable accuracy the mind and influence of Isidore. The position and deference granted to the king is remarkable.