Orkin, Yevgeni(1977 - ) Ukraine
Orlando, Stephanie(1993 - ) Canada
Orning, Tanja(? - ) Norway
Orosco, Maurício(? - ) Brazil
Orozco, Alejandro(? - ) Mexico
Orozco, Keyla(1969 - ) Cuba
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(? - )
Ortiz, Pablo Victor(1956 - ) Argentina
Ortiz, Richard(? - ) USA
Ortiz de Zarate, Juan(? - ) Argentina
Ortiz Torres, Gabriela(1964 - ) Mexico
Ortiz-Alvarado, William(1947 - ) Puerto Rico
Ortolan, Edson Tadeu(1958 - ) Brazil
Orton, Richard(1940 - ) United Kingdom
Orts Ruiz, José Antonio(1955 - ) Spain
Ory, David(? - )
Osada, Moto(? - ) Japan
Osada, Ryszard(1972 - ) Poland
Osawa, Kazuko(1926 - ) Japan