Orbán, György(1947 - ) Hungary
Orbón, Julián(1925 - 1991) Cuba
Ordway, Scott J.(1984 - ) USA
Ore, Østen Mikal(1967 - ) Denmark
Orea, René(1976 - ) Canada
Orekhov, Sergei(1935 - 1998) Russia
Orenstein, Joyce E.(1939 - ) USA
Orfe, John(? - ) USA
Orff, Carl(1895 - 1982) Germany
Orgad, Ben-Zion(1926 - 2006) Israel
Orkin, Yevgeni(1977 - ) Ukraine
Orlando, Stephanie(1993 - ) Canada
Orliński, Piotr(1976 - ) Poland
Orning, Tanja(? - ) Norway
Orosco, Maurício(? - ) Brazil
Orozco, Alejandro(? - ) Mexico
Orozco, Keyla(1969 - ) Cuba
Orphal, Christopher(? - ) USA
Orr, Buxton(1924 - 1997) United Kingdom
Orrego Salas, Juan(1919 - 2019) Chile
Orsi, Andrea(1955 - ) Italy
Orsolino, Federico(1918 - 1993) Italy
Ortega, Jesús(1935 - ) Cuba
Ortega, Miguel(1963 - ) Spain
Ortega Blanco, José(? - 1977) Spain
Ortega Carrillo, Armando(1936 - 1973) Mexico
Ortega-Miranda, Chañaral(1973 - ) Chile
Ortiz, Anibal(? - )