This article does not cite any sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: "Tasius" – news · newspapers · books · scholar · JSTOR (December 2009) (Learn how and when to remove this template message)

Tasius is the name given by Strabo to the king of the Rhoxolani, a Sarmatian tribal group. Around 100 BCE, Tasius led an invasion of Crimea in support of the Scythian warlord Palacus. He was defeated by the Pontian general Diophantus.