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- Nin-Culmell, Joaquín, 1908-20041
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- Noellner, Walter1
- Noon, David, 1946-1
- Nordli, Douglas3
- Nordoff, Paul, 1909-19771
- Norman, Jessye1
- North Texas State University. School of Music1
- Novak, Lionel1
- Nunn, Priscilla1
- Nunn, Thomas1
- Nâzım Hikmet, 1902-19632
- Oakland Symphony Youth Orchestra1
- Ochs, Phil2
- Oddo, Louis1
- Offergeld, Robert1
- Ogeret, Marc1
- Oliveros, Pauline, 1932-20161
- Ondrejka, Ronald1
- Ono, Yōko8
- Onís, Federico de, 1885-19661
- Oppenheim, David, 1922-20071
- Oppens, Ursula3
- Orbón, Julián, 1925-19911
- Orcutt, Eugene1
- Orezzoli, Héctor1
- Orff, Carl, 1895-19821
- Orgel, Irene1
- Orhan Demir Trio1
- Orloff, Gene1
- Ornest, Dorothy1
- Orquesta Sinfónica Nacional de México1
- Orquesta Sinfónica de Puerto Rico1
- Orrego-Salas, Juan, 1919-20191
- Orto, Marbriano de, -15292
- Ostbye, Niels, 1924-20181
- Ostroff, Esther15
- Ostrojinski, Lea1
- Ostrojinsky, Lea2
- Overton, Hall, 1920-19722
- Oxman, Ralph2
- Pachelbel, Johann, 1653-17062
- Pachman, Maurice6
- Paganini, Nicolò, 1782-18402
- Paget, Daniel1
- Pak, Ki-hi, 1921-1
- Palestrina, Giovanni Pierluigi da, 1525?-15947
- Palm, Siegfried1
- Palma, Donald1
- Palma-Nidel, Susan1
- Palmer, Robert, 1915-20102
- Palés Matos, Luis1
- Panitz, Murray1
- Paradise, Timothy1
- Parker, Charlie, 1920-19553
- Parker, Horatio W. (Horatio William), 1863-19191
- Parker, Richard (Tenor)1
- Parloff, Michael2
- Parrott, Lalan7