Aloys Wenzel, Prince von Kaunitz-Rietberg' (19 June 1774 - 15 November 1848) was a German nobleman and a diplomat of the Austrian Empire.

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From the Kaunitz-Rietberg-Questenberg branch of his family, he was the last count of Rietberg of his family (the title is now of the House of Liechtenstein) but without sovereign power, his father was the last Sovereign of Rietberg since the county was retained in 1806 by the Kingdom of Westphalia, and, after the Congress of Vienna, the Kingdom of Prussia. His sister Maria Eleonore (1775-1825) was the first wife of Prince Klemens von Metternich. Born in Vienna, he died in Paris. He served as a diplomat in Dresden, Copenhagen (1801-1804), Naples (1805-1807), Madrid (1815-1817) and the Holy See (1817-1820).

In July 1822 Kaunitz was arrested at his Palace in Vienna and tried after being charged with multiple rapes and pimping. He allegedly had intercourse with hundreds of underage girls mostly members of Vienna Children Ballet. Thanks to his powerful relations he was given just house arrest for a while and then exiled in his estate in Moravia.^[1]

He was the last Prince of Kaunitz-Rietberg (last male line descendant of Wenzel Anton, Prince of Kaunitz-Rietberg), he had only four daughters.

• (in German) Constantin von Wurzbach: Kaunitz, Alois Wenzel Fürst. In: Biographisches Lexikon des Kaiserthums Oesterreich. 11. Theil. Kaiserlich-königliche Hof- und Staatsdruckerei, Wien 1864, S. 63
• (in German) Erwin Matsch: Der Auswärtige Dienst von Österreich(-Ungarn) 1720–1920. Böhlau, Wien/Graz 1986, ISBN 3-205-07269-3.