Oxford Harmonic Choir is a large, mixed-voice amateur choir based in Oxford, England. It is the second-oldest non-collegiate choir in Oxford, having been founded in 1921, and according to The New Grove Dictionary of Music and Musicians is one of the "institutions of lasting significance to Oxford's musical life that were established during this period". Currently the choir has around 150 singing members and usually performs three concerts annually in either the Sheldonian Theatre or Oxford Town Hall with the Orchestra of Stowe Opera.