Florus of Lyon (Latin: Florus Lugdunensis), a deacon in Lyon, was an ecclesiastical writer in the first half of the ninth century. He was probably born shortly before 810. There is no reliable evidence that he was alive after January 859. Florus also used his remarkable knowledge of Augustine to contribute to the Predestination debates of the mid ninth century, in which he defended Gottschalk of Orbais. In the course of these debates, Florus was able to show the inauthenticity of several Pseudo-Augustinian texts.