Flavius Hannibalianus (also Hanniballianus; died September 337) was a member of the Constantinian dynasty, which ruled over the Roman Empire in the 4th century.

Hannibalianus was the son of Flavius Dalmatius, and thus nephew of Constantine the Great.

Hannibalianus married Constantine's elder daughter, Constantina, in 335,[1] and was made nobilissimus.

[3] He and Constantina may have had a daughter named Constantia, who would later marry Memmius Vitrasius Orfitus and become mother of Rusticiana, wife of Quintus Aurelius Symmachus.

[1][2] Probably it was Constantine's intention to put Hannibalianus on the Pontic throne, after the defeat of the Persians.