| Ongjerth, Zsuzsanna | Zsuzsanna Ongjerth (Zsuzsanna Ongjerth) | Actor | 1960 | 1 | |
| Ono, Masutaro | Masutaro Ono (Masutaro Ono) | Actor | 1913 | 1 | |
| Ono, Mizuho | Mizuho Ono (Mizuho Ono) | Actor | 1997 | 1 | |
| Onslow, Michael | Michael Onslow (Michael Onslow) | Actor | 1999 | 30 | |
| Opsann, Aksel | Aksel Opsann (Aksel Opsann) | Actor | 1900 - 1928 | 66 | |
| Orberg, Lisa | Lisa Orberg (Lisa Orberg) | Actor | 1974 | 1 | |
| Orchis, Isella | Isella Orchis (Isella Orchis) | Actor | 1993 | 2 | |
| Orenstein, Sarah | Sarah Orenstein (Sarah Orenstein) | Actor | 2004 | 1 | |
| Orlik, Stanisław | Stanisław Orlik (Stanisław Orlik) | Actor | 1904 - 1924 | 4 | |
| Orliński, Janusz | Janusz Orliński (Janusz Orliński) | Actor | 1904 - 1916 | 9 | |
| Orloff, Penny | Penny Orloff (Penny Orloff) | Actor | 1982 | 1 | |
| Ormond, Claire | Claire Ormond (Claire Ormond) | Actor | 1993 | 1 | |
| Orr, Diane | Diane Orr (Diane Orr) | Actor | 1979 | 1 | |
| Orth, Elisabeth | Elisabeth Orth (Elisabeth Orth) | Actor | 1971 - 1995 | 6 | |
| Osborn, Elmar | Elmar Osborn (Elmar Osborn) | Actor | 1955 | 1 | |
| Osborne, Dorithy | Dorithy Osborne (Dorithy Osborne) | Actor | 1943 | 1 | |
| Osborne, Si | Si Osborne (Si Osborne) | Actor | 2001 | 2 | |
| Ostermayer, Christine | Christine Ostermayer (Christine Ostermayer) | Actor | 1965 - 1969 | 3 | |
| Oswald, Axsel | Axsel Oswald (Axsel Oswald) | Actor | 1936 - 1937 | 2 | |
| Ott, Günther | Günther Ott (Günther Ott) | Actor | 1931 | 1 | |
| Ottavino, John | John Ottavino (John Ottavino) | Actor | 1997 | 1 | |
| Ottesen, Helle | Helle Ottesen (Helle Ottesen) | Actor | 1975 - 2013 | 7 | |
| Otto, Miranda | Miranda Otto (Miranda Otto) | Actor | 2002 - 2015 | 2 | |
| Otto, Pavel | Pavel Otto (Pavel Otto) | Actor | 1957 | 1 | |
| Outin, Régis | Régis Outin (Régis Outin) | Actor | 1928 - 1978 | 4 | |
| Overbey, Kellie | Kellie Overbey (Kellie Overbey) | Actor | 1998 | 1 | |
| Owen, Marianne | Marianne Owen (Marianne Owen) | Actor | 1978 - 1996 | 4 | |
| Owings, Sarah | Sarah Owings (Sarah Owings) | Actor | 1976 | 1 | |
| O'Brien, Eileen | Eileen O'Brien (Eileen O'Brien) | Actor | 2000 | 8 | |
| O'Neil, Raymond | Raymond O'Neil (Raymond O'Neil) | Actor | 2000 | 1 | |
| Oftebro, Nils Ole | Nils Ole Oftebro (Nils Ole Oftebro) | Actor | 1970 - 2018 | 92 | |
| O'Malley, Flynn | Flynn O'Malley (Flynn O'Malley) | Actor | 1963 | 1 | |
| O'Connor, Terrence | Terrence O'Connor (Terrence O'Connor) | Actor | 1963 | 1 | |
| Olsen, Kathe B. | Kathe B. Olsen (Kathe B. Olsen) | Actor | 2002 | 1 | |
| Ornäs, Gustaf Hiort, af | Gustaf Hiort af Ornäs (Gustaf Hiort af Ornäs) | Actor | 1956 | 1 | |
| Ousdal, Sverre Anker | Sverre Anker Ousdal (Sverre Anker Ousdal) | Actor | 1983 - 2020 | 40 | |
| Osterberger, - | - Osterberger (- Osterberger) | Actor | 1971 | 2 | |
| Ovčinnikova, O. | O. Ovčinnikova (O. Ovčinnikova) | Actor | 1999 - 2000 | 2 | |
| Oriane, Francoise | Francoise Oriane (Francoise Oriane) | Actor | 1984 | 1 | |
| O'Connor, Kaleigh | Kaleigh O'Connor (Kaleigh O'Connor) | Actor | 2002 | 1 | |
| O'Connor, Savannah | Savannah O'Connor (Savannah O'Connor) | Actor | 2002 | 1 | |
| Oppi, Frk. | Frk. Oppi (Frk. Oppi) | Actor | 1941 | 1 | |
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