Cotiso, Cotish or Cotison (flourished c. 30 BC) was a Dacian or Getic king who apparently ruled the mountains between Banat and Oltenia (modern-day Romania).

[1] Florus wrote in his account of Roman history that Cotiso and his armies used to attack towards south when the Danube froze.

According to Alban Dewes Winspear and Lenore Kramp Geweke he "proposed that the war should be fought in Macedonia rather than Epirus.

[5] Suetonius (LXIII, Life of Augustus) says Mark Antony wrote that Augustus betrothed his daughter Julia to marry Cotiso (M. Antonius scribit primum eum Antonio filio suo despondisse Iuliam, dein Cotisoni Getarum regi) to create an alliance between the two men.

According to Dio, the story about the proposed marriages is hardly credible and may have been invented by Mark Antony as propaganda to offset his own alliance with Cleopatra.

[5] After Augustus's victory in the civil wars, the Romans punished the Dacian ruler, who was apparently defeated in battle around 25 BC.

[6] In an ode dedicated to his protector, Horace advises him not to worry about Rome's safety, because Cotiso's army has been crushed.