This article provides an overview of censorship and book bans in Austria between 1751 and 1848. It is based on the catalogues and lists of banned manuscripts and books and the available censorship regulations and censors’ protocols; moreover, the most important persons involved in censorship such as Gerard van Swieten, Count Sedlnitzky, and Metternich are introduced, and their impact on the book trade is shown. From an instrument encouraging Enlightenment and defending morality during the reign of Maria Teresa and Joseph II, censorship became a major factor of political repression after the French Revolution. The focus moved from the protection of Catholicism against Protestant “heresy” and superstition to the defense of monarchy against liberalism and nationalism. The aim of enlightening the citizens and promoting their happiness pursued during the second half of the eighteenth century was replaced by the will to maintain the “peace” of the state and suppress any ideas that confounded its interests.