Jean Étienne Philibert de Prez de Crassier or Étienne Desprez-Crassier (18 January 1733 – 6 July 1803) was a French political and military leader in the early years of the French Revolutionary Wars. Despite being from the minor nobility, he entered the French Royal Army as a cadet at the age of 12 because of his family's poverty. He fought in the War of the Austrian Succession and the Seven Years' War, becoming a colonel in 1785 and retiring two years later. Voltaire lent him the money needed to recover the Deprez family property. He was elected to the Estates General as a nobleman in 1789. After being promoted to lieutenant general he led a division at Valmy in 1792. He became commander of the "Army of the Rhine" and "Army of the Western Pyrenees". Imprisoned during the Reign of Terror, he was released and restored to his former rank but retired in 1796.