Otto, Duke of Austria

Otto the Merry
Portrait by Anton Boys, c. 1580
Duke of Austria and Styria (jointly with Albert II)
Reign1330–1339
PredecessorFrederick the Fair
SuccessorAlbert II (alone)
Duke of Carinthia (jointly with Albert II)
Reign1335–1339
PredecessorHenry of Bohemia
SuccessorAlbert II (alone)
Born23 July 1301
Vienna, Austria
Died17 February 1339
Neuberg Abbey, Duchy of Styria
SpousesElizabeth of Bavaria
Anne of Bohemia
IssueFrederick II, Duke of Austria
Leopold II, Duke of Austria
HouseHabsburg
FatherAlbert I of Germany
MotherElisabeth of Carinthia

Otto, known as the Merry (German: der Fröhliche; 23 July 1301 – 17 February 1339), was Duke of Austria and Styria from 1330, as well as Duke of Carinthia from 1335 until his death. A member of the House of Habsburg, he ruled jointly with his elder brother Duke Albert II.