| Oesterle, Michael (1968- ) |
| Offenbach, Jacques (1819-1880) |
| Olofsson, Kent (1962- ) |
| Ordieres, Alfonso (1930-2022) |
| O'Regan, Tarik (1978- ) |
| Orff, Carl (1895-1991) |
| Ortiz, Gabriela (1964- ) |
| Oscher, Efrain (1974- ) |
| Ostinelli, Giona (1986- ) |
| Ouzounoff, Alexandre (1955- ) |
| Overton, David |
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