Otto von Pack (c. 1480 – 8 February 1537), German conspirator.
Life
He studied at the University of Leipzig, and obtained a responsible position under George, Duke of Saxony, which he lost owing to his dishonesty. In 1528, he revealed to Philip, Landgrave of Hesse, the details of a scheme agreed upon in Breslau by the archduke Ferdinand, afterwards the emperor Ferdinand I, and other influential princes, to conquer Hungary for Ferdinand and then to attack the reformers in Germany.
Pack was sent to Hungary to concert joint measures with John Zapolya, the opponent of Ferdinand in that country, but John, Elector of Saxony, advised that the associates of Ferdinand should be asked to explain their conduct, and Pack's revelations were discovered to be false; the copy of the treaty which he had shown to Philip proving to be a forgery.