Count Friedrich August von Harrach-Rohrau, (Vienna, 8 June 1696 - Vienna, 4 June 1749), was plenipotentiary minister of the Austrian Netherlands (1732–1741) and became Governor-General ad interim in 1741–1744.He was also High Chancellor of Bohemia from 1745 until his death.
By birth member of the House of Harrach, he was born as the eldest son and child of Count Aloys Thomas Raimund von Harrach und Rohrau (1669–1742) and his second wife Countess Anna Caecilie von Thannhausen (1674–1721).
He married Princess Maria Eleonora of Liechtenstein (1703 – 17 July 1757), the youngest daughter of Prince Anton Florian of Liechtenstein and his wife Countess Eleonore Barbara von Thun und Hohenstein, on 5 February 1719. They had 16 children:
Ernst Guido's great-great-grandson was Lieutenant Colonel Count Franz von Harrach, Archduke Franz Ferdinand of Austria's Aide-de-camp when he was assassinated in Sarajevo on 28 June 1914.
Ghislaine De Boom, Les ministres plénipotentaires dans les Pays-Bas autrichiens, principalement Cobenzl, Brussels: Académie Royale de Belgique (1932).
Ghislaine De Boom, "L'Archiduchesse Marie-Elisabeth et les Grands Maitres de la cour", Revue Belge de Philologie et d'Histoire 5/2-3 (1926), pp. 495–506.