Flavianus – the adjectival form of the Latin name Flavius – may refer to:
Marcus Pompeius Silvanus Staberius Flavianus, 1st-century Roman consul Lucius Septimius Flavianus Flavillianus, 3rd-century Roman athlete Marcus Cocceius Anicius Faustus Flavianus, 3rd-century Roman consul Flavianus (prefect of Egypt), 4th-century prefect of Roman Egypt Virius Nicomachus Flavianus, also known as Flavianus the Elder, 4th-century Roman consul and prefect of Italy Nicomachus Flavianus, also known as Flavianus the Younger, son of Virius Nicomachus Flavianus Flavianus of Avellino ( 311), priest from Antioch, see Modestinus, Florentinus and Flavianus Flavian of Constantinople ( 449), patriarch Fravitta of Constantinople, also known as Flavian II of Constantinople ( 490), patriarch Flavian I of Antioch, 4th-century archbishop Flavian II of Antioch, late 5th- and early 6th-century archbishop Flavianus of Adramyttium, 5th-century bishop of Adramyttium Flavianus (bishop of Cotenna), 6th-century bishop of Cotenna Flavianus Michael Malke (1858–1915), Syrian Catholic eparch of Cizre
See also Flavian (disambiguation)