Princess Marie d'Orléans (Marie Amélie Françoise Hélène; 13 January 1865 – 4 December 1909) was a French princess by birth and a Danish princess by marriage, as the wife of Prince Valdemar. She was politically active by the standards of her day.

Marie was the eldest child of Robert, duke of Chartres, and his wife, Princess Françoise d'Orléans. Her father was the second son of Ferdinand Philippe, Duke of Orléans, and Duchess Helena of Mecklenburg-Schwerin. Françoise was the daughter of François d'Orléans, prince de Joinville, and Princess Francisca of Brazil.

Born during the reign in France of her family's rival, Napoléon III, she grew up in England, where her family had moved in 1848. She moved to France with her family after the fall of Napoleon in 1871. She defined herself as "une bourgeoise".

After obtaining papal consent, Marie married Prince Valdemar of Denmark, the youngest son of King Christian IX of Denmark, on 20 October 1885 in a civil ceremony in Paris and again in a religious ceremony in the Château d'Eu two days later. She remained a Roman Catholic, he a Lutheran. They adhered to the dynastic arrangement usually stipulated in the marriage contract in such circumstances: sons were to be raised in the faith of their father, daughters in that of their mother.

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