Fabius Titianus was a Roman politician and senator in the fourth century AD.
Titianus had a long and successful career as an official; during his life he held many positions in the Empire, including the consulship.
[2] He supported the rebellion of the usurper Magnentius, for which he was again appointed Urban Prefect of Rome, holding the office from 350 to 351 AD.
Shortly before the Battle of Mursa, Titianus arrived at the court of Constantius II as the ambassador of Magnentius.
He accused the Constantinian dynasty of allowing the destruction of cities through negligence and advised him to abdicate in favor of Magnentius.