Decius was a 3rd-century Roman emperor.
Decius may also refer to:
Decia gens for several other Ancient Romans Publius Decius Mus (consul 340 BC), Roman general and politician that sacrificed himself in battle during the Latin War Decius (consul 529), Flavius Decius (fl. 529-546), politician of the Eastern Roman Empire Decius (Exarch), first Exarch of Ravenna 584–585 Decius Wadsworth (1768-1821), Colonel in the Ordnance Corps of the United States Army who, in 1817, created Wadsworth's cipher Filippo Decio (1454–1535), Italian jurist Nikolaus Decius (c.1485–1541), German minister and hymn writer Iodocus Ludovicus Decius (1485-1545), secretary to the Polish king Sigismund I the Old Tom Cross (computer security), American technology expert who works under the pseudonym Decius, from Decius Wadsworth Decius (band), a London-based electronic music band A misspelling of Decimus Junius Brutus Albinus as "Decius Brutus" in William Shakespeare's Julius Caesar