Otto Rudolf Theobald Ottokar Maria Graf Czernin von und zu Chudenitz (Czech: Otto Rudolf Theobald Ottokar Maria hrabě Černín z Chudenic; 27 August 1875 – 14 June 1962) was an Austro-Hungarian diplomat during the time of World War I.

[citation needed] Following studies at the Diplomatic Academy, Count von Czernin entered the Austro-Hungarian foreign service and was first dispatched to London and in 1904 to Rome.

He was considered a disciple of Foreign Minister Count Lexa von Aehrenthal, whose activist expansionary policies he supported during the Bosnian annexation crisis in 1908.

After the war, Count von Czernin resigned from public service and sought to ward off expropriations of his Bohemian estates in Czechoslovakia.

[3] In the 1930s, he expressed some sympathies with the Nazi Party, although his son, Manfred (who had remained with his mother in England), was a RAF pilot during World War II.