Otto III of Carinthia

Otto III of Carinthia (c. 1265–25 May 1310) was a son of Duke Meinhard of Carinthia and Elisabeth of Bavaria. When Meinhard died in 1295, Otto inherited the Duchy of Carinthia and the County of Tyrol, ruling jointly with his brothers Louis and Henry VI. In 1305 he expanded the market at Gries against bishop-controlled Bolzano.

In 1297 he married Euphemia of Legnica, who bore him four daughters. He died without male issue and was succeeded by Henry VI.