Otto I (c. 1180 – 7 May 1234), a member of the House of Andechs, was Duke of Merania from 1204 until his death. He was also Count of Burgundy (as Otto II) from 1208 to 1231, by his marriage to Countess Beatrice II, and Margrave of Istria and Carniola from 1228 until his death.