Isabelle of Orléans or Isabelle d'Orléans may refer to: Élisabeth Marguerite d'Orléans (1646-1696), Duchess of Alençon and Angoulême Princess Marie Isabelle of Orléans (1848–1919), Spanish infanta and French princess Princess Isabelle of Orléans (1878–1961), member of the French Orleanist royal family and by marriage Duchess of Guise Princess Isabelle of Orléans (1900–1983), member of the House of Orléans and by marriage Countess of Harcourt Princess Isabelle of Orléans-Braganza (1911–2003), historical author and consort of the Orleanist pretender, Henri, Count of Paris