Viator of Lyons was a fourth-century Catholic deacon from Lyon who is remembered for his devotion to his bishop. Serving as a lector or catechist at the Lyon Cathedral, he was highly respected by the local congregation and Bishop Justus. Following his mentor's decision to seek a monastic life, Viator traveled to Egypt to join him. The two men eventually reached the desert of Scetes, where they lived as ascetics before both passing away around 389.