Louise Diane d'Orléans (27 June 1716 – 26 September 1736) was the last child of Philippe d'Orléans, Duke of Orléans ("Regent of the Kingdom" from 1715 to 1723) and his wife, Françoise Marie de Bourbon, the youngest illegitimate daughter of King Louis XIV of France and his mistress, Madame de Montespan. The Princess of Conti by marriage, she died in childbirth at the age of twenty. Some sources refer to her as "Louis Diane". The princess used the name Louise.