Louis Victor de Rochechouart de Mortemart, Duke of Mortemart (25 August 1636 – 15 September 1688) was a French nobleman and member of the ancient House of Rochechouart. His father Gabriel de Rochechouart de Mortemart was a childhood friend of Louis XIII. His older sister was Gabrielle de Rochechouart de Mortemart, the celebrated beauty of the era; another sister was Madame de Montespan herself the mistress of Louis XIV. He was Général des galères and Marshal of France, Maréchal de Vivonne.