Antoine, Duke of Montpensier (Antoine Marie Philippe Louis d'Orléans; 31 July 1824 – 4 February 1890), was a member of the French royal family in the House of Orléans. He was the youngest son of King Louis Philippe of France and his wife Maria Amelia Teresa of the Two Sicilies. He was styled as the Duke of Montpensier. He was born on 31 July 1824 at the château de Neuilly and died 4 February 1890 at Sanlúcar de Barrameda, Spain.