Claude Le Jeune (ca. 1530-1600) was a Flemish composer active in France. He created a new species of composition, musique mesurée, and was also acclaimed for his numerous settings of the French Psalter.

Born in Valenciennes (now in France, then part of Flanders), Claude Le Jeune spent his earliest years in Flanders and may have traveled thereafter to Venice for a stay with the composer Adrian Willaert. Le Jeune settled in Paris about 1564. Although an avowed Huguenot, he was in charge of planning musical activities at the French court, particularly those attending the marriage of the Duc de Joyeuse in 1581. The following year saw the composer's appointment as maistre des enfans de musique to François d'Anjou, brother of King Henry III. In 1596 Le Jeune was listed as maistre compositeur ordinaire de la musique to King Henry IV and retained this post until his death...