Decius was a 3rd-century Roman emperor.

Decius may also refer to:

• Decia gens for several other Ancient Romans
• 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
• Tom Cross (computer security), American technology expert who works under the pseudonym Decius, from Decius Wadsworth
• A misspelling of Decimus Junius Brutus Albinus as "Decius Brutus" in William Shakespeare's Julius Caesar

This disambiguation page lists articles associated with the title Decius.
If an internal link led you here, you may wish to change the link to point directly to the intended article.