Chiara Margarita Cozzolani (27 November 1602 – ca. 1676–1678), was a Baroque music composer, singer and Benedictine nun.[1] She spent her adult life cloistered in the convent of Santa Radegonda, Milan, where she served as prioress and abbess and stopped composing. She was one of more than a dozen cloistered women who published sacred music in seventeenth-century Italy.[2]