John O'Hara
Librettist
Mike O'Malley
Librettist, Playwright
Bill Oakes
Richard Oberacker
Playwright, Librettist, Composer
Jacques Offenbach
Composer
Domenico Oliva
Lyricist
Stephen Oliver
John "Ole" Olsen
Paul Olson, M.D.
Phil Olson
Susanna Opsal
Playwright
Carl Orff
