Gilbert Reaney (11 January 1924 – 22 March 2008) was an English musicologist who specialized in medieval and Renaissance music and theory. Described as "one of the most prolific and influential musicologists of the past century", Reaney made significant contributions to his fields of expertise, particularly on the life and works of Guillaume de Machaut, as well as medieval music theory. He also wrote about medieval and Renaissance literature. Among his notable publications are the book for the Oxford Studies of Composers series; new editions on various early music composers, particularly Baude Cordier; major new editions of works by music theorists Franco of Cologne and Philippe de Vitry; and on a variety of subjects for The New Grove Dictionary of Music and Musicians and the subsequent