Johannes Brenz (born June 24, 1499, Weil, Württemberg [Germany]—died September 11, 1570, Stuttgart) was a German Protestant Reformer, principal leader of the Reformation in Württemberg.
He studied at Heidelberg and was ordained a priest in 1520, but by 1523 he had ceased to celebrate mass and had begun to speak in favour of the Reformation. Brenz supported the views of Martin Luther; in Syngramma Suevicum (1525) he expounded Luther’s doctrine of the real presence of Christ in the Eucharist.