Ortiz, Richard(? - ) USA
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
Osborn, Laurence(1989 - ) United Kingdom
Osborne, Nigel(1948 - ) United Kingdom
Oser, Martin(1955 - )
Osman, Ali(1958 - ) Sudan
Osmun, Douglas(? - ) USA
Osorio, Daniel(1971 - ) Chile
Ospald, Klaus(1956 - ) Germany
Ossowski, Michal(1984 - ) Poland
Ostarek, Hans(? - )
Ostendorf, Jens-Peter(1944 - 2006) Germany
Osterfield, Paul(? - ) USA
Österling, Fredrik(1966 - ) Sweden
Ostermeier, Thorben(1977 - ) Germany
Otai, Tsuyoshi(1932 - ) Japan
Oteri, Frank J.(1964 - ) USA
Otero, Francisco(1940 - ) Spain
Otondo, Felipe(1972 - ) Chile
Otsa, Harri(1926 - 2001) Estonia