- Ostbye, Niels, 1924-20181
- Ostrojinski, Lea1
- Ostrojinsky, Lea2
- Overton, Hall, 1920-19722
- Oxman, Ralph2
- Pachman, Maurice6
- Palma, Donald1
- Palma-Nidel, Susan1
- Palmer, Robert, 1915-20102
- Panitz, Murray1
- Paradise, Timothy1
- Parker, Horatio W. (Horatio William), 1863-19191
- Parker, Richard (Tenor)1
- Parloff, Michael2
- Parrott, Lalan7
- Passaro, Joseph1
- Payne, Dorothy1
- Peck, Russell, 1945-20091
- Pegago, Donald1
- Pellegrino, Ronald1
- Penn, William, 1943-1
- Perera, Ronald1
- Perle, George, 1915-20091
- Perlis, Vivian1
- Perras, John4
- Perry, Julia, 1924-19792
- Persichetti, Vincent, 1915-19871
- Persky, Stanley (Clarinetist)1
- Peskanov, Mark1
- Pettis, Ashley, 1892-3
- Phillips, Barre2
- Phillips, Burrill4
- Phillips, Peter, 1930-1
- Phillips, Robert (Pianist)1
- Phoenix Quartet1
- Pilgrim, Neva2
- Piltz, Hans-Karl1
- Pinkham, Daniel1
- Piston, Walter, 1894-19762
- Pittman, James T1
- Pixley-Rothschild, Dorothy7
- Polin, Claire C. J1
- Polisi, Joseph1
- Politis, James, 1921-19761
- Pollikoff, Max8
- Pollock, Robert, 1946-1
- Ponce, Walter2
- Porter, Karl Hampton, 1939-1
- Porter, Lois, 1905-19801
- Porter, Quincy, 1897-19663
- Portnoy, Donald1
- Pound, Ezra, 1885-19721
- Powell, John, 1882-19631
- Powell, Mel1
- Price, Erwin L2
- Price, Irving1
- Price, Leontyne1
- Price, Paul, 1921-19864
- Pruett, Elizabeth1
- Purswell, Patrick1