| Olmo, Francisco | Francisco Olmo | Actor | 1982 | 3 | |
| Ouwehand, Roos | Roos Ouwehand | Actor | 1992 | 1 | |
| Offermans, Sylvia | Sylvia Offermans | Actor | 1992 | 1 | |
| Oeser, Wolf | Wolf Oeser | Actor | 1989 - 1994 | 6 | |
| O'Neill, Molly | Molly O'Neill | Actor | 1993 | 1 | |
| O'Hea, Brendan | Brendan O'Hea | Actor | 1993 - 1999 | 6 | 1 |
| Orenstein, Joan | Joan Orenstein | Actor | 1981 - 1991 | 3 | |
| Ogier, Bulle | Bulle Ogier | Actor | 1993 | 4 | 1 |
| Oswald, Birgit | Birgit Oswald | Actor | 1993 | 1 | |
| O'Brien, Tony | Tony O'Brien | Actor | 1993 | 1 | |
| Obst, Dietmar | Dietmar Obst | Actor | 1993 - 1999 | 2 | |
| Obrecht, Urs | Urs Obrecht | Actor | 1991 | 1 | |
| Overloop, Veerle van | Veerle van Overloop | Actor | 1993 | 1 | |
| Ollinger, Hans | Hans Ollinger | Actor | 1993 | 1 | |
| Ochlast, Jens | Jens Ochlast | Actor | 1993 - 2015 | 3 | |
| Oberholz, Dieter | Dieter Oberholz | Actor | 1993 - 2004 | 3 | |
| Ottosson, Annelie | Annelie Ottosson | Actor | 1993 | 2 | |
| Overbeeke, Adri | Adri Overbeeke | Actor | 1991 - 1992 | 84 | |
| Ottlik, Ádám | Ádám Ottlik | Actor | 1996 - 2008 | 2 | 1 |
| Ott, Friederike | Friederike Ott | Actor | 2014 - 2016 | 12 | 1 |
| Oikonomidou, Miranta | Miranta Oikonomidou | Actor | 1965 - 1994 | 4 | |
| Ortmayr, Heinrich | Heinrich Ortmayr | Actor | 1982 | 1 | |
| Okhlupin, Igor | Igor Okhlupin (Игорь Охлупин) | Actor | 2013 | 1 | |
| Olszewska, Izabella | Izabella Olszewska | Actor | 1994 | 1 | |
| O'Connor, Frances | Frances O'Connor | Actor | 1994 | 1 | |
| O'Sullivan, Barney | Barney O'Sullivan | Actor | 1976 - 1980 | 2 | |
| Ogawa, Shinji | Shinji Ogawa | Actor | 1980 | 1 | |
| Oug, Linda | Linda Oug | Actor | 1980 | 1 | |
| O'Brien, Paul | Paul O'Brien | Actor | 1980 | 1 | |
| Ostan, Boris | Boris Ostan | Actor | 1994 | 1 | |
| Ostan Vejrup, Jette | Jette Ostan Vejrup | Actor | 1994 | 1 | |
| Osmond, David | David Osmond | Actor | 2012 | 1 | 1 |
| O'Kane, Patrick | Patrick O'Kane | Actor | 2000 | 1 | 1 |
| Odegard, Julia | Julia Odegard | Actor | 1980 | 1 | |
| Oglesby, Thomas | Thomas Oglesby | Actor | 1977 - 1980 | 2 | 1 |
| Ognjanov, Ivo | Ivo Ognjanov | Actor | 1994 | 1 | |
| Orav, Aksel | Aksel Orav | Actor | 1962 - 1997 | 5 | |
| Olsén, Ruth | Ruth Olsén | Actor | 1995 | 5 | |
| Opela, H. Kevin | H. Kevin Opela | Actor | 1996 | 1 | |
| Oligny, Huguette | Huguette Oligny | Actor | 1996 | 1 | 1 |
| Oswald, Christof | Christof Oswald | Actor | 1996 | 1 | |
| Oristânio, Giuseppe | Giuseppe Oristânio | Actor | 1997 - 1998 | 3 | |
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