Florianus (-276); also known as Florian; was the maternal half-brother of Emperor Tacitus. He was made Praetorian Prefect by Tacitus in his war against the Goths; and when Tacitus died in 276; the army in the West declared Florian the next emperor without the consent of the Senate.

Florian had the support of many of the western provinces; while rival claimant Probus had the support of the eastern provinces. The two rivals fought each other at the Battle of Cilicia; with Florian possessing the larger army but Probus being a more experienced general.

Florian's army; not used to the hot and dry climate of Cilicia; soon began to lose their confidence. They eventually turned on him and executed him in September 276; barely eighty-eight days into his reign.