Maria Carolina of Austria (Maria Carolina Louise Josepha Johanna Antonia; 13 August 1752 – 8 September 1814) was Queen of Naples and Sicily as the wife of King Ferdinand IV and III, who later became King of the Two Sicilies. As de facto ruler of her husband's kingdoms, Maria Carolina oversaw the promulgation of many reforms, including the revocation of the ban on Freemasonry, the enlargement of the navy under her favorite, Sir John Acton, and the expulsion of Spanish influence. She was a proponent of enlightened absolutism until the advent of the French Revolution, when, in order to prevent its ideas gaining currency, she made Naples a police state.
Born an archduchess of Austria, the thirteenth child of Empress Maria Theresa and Holy Roman Emperor Francis I, Maria Carolina married Ferdinand as part of an Austrian alliance with Spain, of which Ferdinand's father was king. Following the birth of a male heir in 1775, Maria Carolina was admitted to the Privy Council. She dominated the Council until 1812, when she was sent back to Vienna. Like her mother, Maria Carolina arranged politically advantageous marriages for her children. Maria Carolina promoted Naples as a centre of the arts, patronising painters Jacob Philipp Hackert and Angelica Kauffman, and academics Gaetano Filangieri, Domenico Cirillo and Giuseppe Maria Galanti.