Guillaume de Joyeuse (1520–1592) was a French military commander during the French Wars of Religion. Originally destined for the church, he assumed the office of vicomte de Joyeuse upon the death of his elder brother in 1554. He was subsequently appointed at lieutenant-general of Languedoc, under the governor Antoine de Crussol. In this capacity he established himself as a harsh persecutor of Protestantism. When the civil wars broke out in 1562 he assumed his military responsibilities, regularly fighting with the viscomtes de Languedoc throughout the early civil wars. He achieved a notable victory against them in 1568 on the field of Montfran. He did not spread the Massacre of Saint Bartholomew into the territory he controlled and remained loyal to the crown during the fifth civil war, fighting with the Malcontents. In 1582 he was elevated to Marshal of France by Henri III. He found himself increasingly drawn to the Catholic League (France) after its formal formation and when Henri III was assassinated in 1589 he fought against Navarre for Charles, Duke of Mayenne and the league. He died in 1592.

Marshal of France is a French military distinction, rather than a military rank, that is awarded to generals for exceptional achievements. The title has been awarded since 1185, though briefly abolished (1793–1804) and for a period dormant (1870–1916). It was one of the Great Officers of the Crown of France during the Ancien Régime and Bourbon Restoration, and one of the Grand Dignitaries of the Empire during the First French Empire.