Domitian of Carantania or Domitian of Carinthia (German: Domitian von Kärnten, Slovene: Domicijan Koroški; died c. 802), also known as Domislav and Tuitianus, was a Slavic nobleman in the principality of Carantania (present-day Carinthia, Austria) during the reign of Charlemagne. He is regarded as the legendary founder of the Millstatt Abbey church and was venerated as a Catholic saint.