O'Connor, Mark

O'Regan, Tarik

Obouhov, Nikolai

Obradors, Fernando Jaumandreu

Obrecht, Jacob

Obst, Michael

Ochs, Siegfried

Ockeghem, Johannes

Odoyevsky, Vladimir

Oede de la Couroierie

Oehring, Helmut

Oestreich, Carl

Offenbach, Jacques

Ohana, Maurice

Olbrisch, Franz-Martin

Oley, Johann Christoph

Oliveira, Angenor de (Cartola)

Oliveira, Manoel Dias

Onslow, Georges

Oosten, Roel

Orbán, György

Orff, Carl

Orkin, Evgeni

Ornstein, Leo

Orologio, Alessandro

Orr, Buxton

Ortiz, Diego

Osborne, Willson

Ostendorf, Jens-Peter

Österling, Fredrik

Ostermann

Ostrcil, Otakar

Othegraven, August von

Othmayr, Kaspar

Ottani, Bernardo

Ovalle, Jaime

Ozi, Etienne