Severus of Trier was a 5th-century Catholic bishop who led the diocese of Trier starting around 445 or 446. He is primarily recognized for his missionary efforts among Germanic tribes, such as the Alemanni and Rhine Franks, located near the Middle Rhine and lower Moselle. During his career, he reportedly accompanied Germanus of Auxerre on a mission to Britain to oppose Pelagianism. Historical accounts suggest he may have been a student of Lupus of Troyes during the 430s.