Composers
| Composer name | Year of Birth | Death | Compositions in database |
|---|---|---|---|
| Oborný, Václav | 1915 | 2000 | 13 |
| Obrovská, Jana | 1930 | 1987 | 40 |
| Očenáš, Andrej | 1911 | 1 | |
| Odstrčil, Karel | 1930 | 1997 | 100 |
| Oliva, Jan | 1923 | 1986 | 2 |
| Ondráček, Bedřich | 1932 | 1956 | 1 |
| Ondráček, Bohuslav (Bob) | 1932 | 1 | |
| Ondrůšek, Tomáš | 1964 | 5 | |
| Ondruška, Vlastimil | 2 | ||
| Opálková, Tereza | 2 | ||
| Opršál, Martin | 1968 | 1 | |
| Orany, Otto | 1 | ||
| Ostrčil, Otakar | 1879 | 1935 | 20 |
| Osvald, Miloslav | 1946 | 8 | |
| Otto, Valerius | 2 | ||
| Ožana, Petr | 1 |