Cotiso or Cotison (flourished c. 30 BC) was a Dacian king who apparently ruled the mountains between Banat and Oltenia (modern-day Romania). Horace calls him king of the Dacians. Suetonius calls him king of the Getae. He is mentioned also by Florus, who wrote that Cotiso and his armies used to attack towards south when the Danube froze.
Several scholars believe he is identical to Coson, a Dacian king whose name appears on many gold Staters found in Transylvania.