Princess Isabelle Françoise Hélène Marie d'Orléans (27 November 1900, Le Nouvion-en-Thiérache, France – 12 February 1983, Neuilly-sur-Seine, France) was a member of the House of Orléans and, by marriage, a member of the ducal Harcourt family and of the princely House of Murat.
She was one of the four children of Prince Jean, Duke of Guise (1874–1940), who would become the Orleanist pretender to the French throne in 1926, and Princess Isabelle of Orléans. Although born in France, her parents moved the family to Morocco in 1909, then a French colony. She was with her mother and siblings visiting France when World War I broke out in 1914. While her father sought in vain to obtain permission from the French government to serve in the military, the rest of the family hastened back to Morocco.
Marriages
In 1923 the tradition of Orléans princesses marrying only other royalty (since the alleged 1681 wedding of La Grande Mademoiselle) was dispensed with, as nearly all of her relatives attended Isabelle's wedding at Amélie of Orléans château in Le Chesnay on 12 September to Count Bruno d'Harcourt (1899–1930), son of Count Eugène d'Harcourt and Armande de Pierre de Bernis. An automobile racer, Harcourt was killed during practice for the Moroccan Grand Prix, leaving his wife with four children:
Count Bernard d'Harcourt (1 January 1925 – 4 September 1958). His first marriage, on 4 November 1948, to Zénaïde Rachewska (1 September 1930 – 20 October 1973), ended in divorce and was childless. He wed secondly on 27 January 1951 Yvonne de Contades (22 April 1928 – 24 December 2021), and had issue from his second marriage:
Count Bruno Jean d'Harcourt (26 October 1951 – 14 May 2020)
Count François d'Harcourt (born 21 June 1953) married 4 July 1981 Colombe Anouilh (born 7 October 1956, daughter of Jean Anouilh and Nicole Lançon), with issue:
Gilone d'Harcourt (1 January 1927 – 14 March 2019) married in 1950 Count Antoine de Dreux-Brézé (22 August 1928 – 13 May 2013), and has issue.