Johann Peter Friedrich Ancillon (born April 30, 1767, Berlin, Prussia—died April 19, 1837, Berlin) was a Prussian statesman, foreign minister, historian, and political philosopher who worked with the Austrian statesman Metternich to preserve the reactionary European political settlement of 1815.
Educated in Geneva, Ancillon acquired a chair in history at the Berlin Military Academy in 1792. After the publication of Tableau des révolutions du système politique de l’Europe depuis le XVe siècle, 4 vol. (1803–05; “View of European Political Revolutions Since the Fifteenth Century”), he was admitted to the Berlin Academy and became tutor to the future Frederick William IV, in whom he instilled a deep antipathy toward revolution.
During his service with the ministry of foreign affairs, which he headed from 1832 until his death, Ancillon, a Prussian nationalist and romantic, worked closely with Austria and Russia in combating liberalism.