The Harnoncourt-Unverzagt family is an old Austrian noble family, which came to Austria from the Duchy of Lorraine, but originated in Luxembourg.
History Counts d'Harnoncourt intermarried with Unverzagt family in the 18th century when Joseph Ludwig Matthias de la Fontaine, Count of Harnoncourt (1736–1816) married Countess Maria Leopoldine Unverzagt (1754–1835), who was the last of her line.
Their son Count Herbert Ludwig de la Fontaigne, Count of Harnoncourt (1789–1846), took over her coat of arms in 1839 and called himself Graf von Harnoncourt-Unverzagt.
All members of this aristocratic family have descended from him and his wife, Countess Sophie von Haugwitz (1798–1859).
Notable members Alice d'Harnoncourt (1930–2022), Austrian violinist, wife of Nikolaus Anne d'Harnoncourt (1943–2008), American museum director, historian of modern art and daughter of Rene Franz d'Harnoncourt (born 1937), Austrian jurist, brother of Nikolaus Karl d'Harnoncourt (born 1934), Austrian physician, brother of Nikolaus Ladislaja d'Harnoncourt (1899–1997), mother of Nikolaus, Philipp, Franz and Karl Nikolaus d'Harnoncourt (1929–2016), Austrian conductor, son of Ladislaja Philipp d'Harnoncourt (1931–2020), Austrian theologian, brother of Nikolaus Rene d'Harnoncourt (1901–1968), Austrian-American museum director
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