| Oltean, Silviu | Silviu Oltean | Actor | 2009 | 3 | |
| Olaru, Orodel | Orodel Olaru | Actor | 2009 | 4 | |
| Orheian, Vasile Ioan | Vasile Ioan Orheian | Actor | 2009 | 1 | |
| Okada, Yoshihiro | Yoshihiro Okada | Actor | 1999 - 2006 | 2 | |
| Oswald, Simone | Simone Oswald | Actor | 2006 | 1 | |
| Oxnam, Brad | Brad Oxnam | Actor | 2006 | 1 | |
| O'Neal, Timothy | Timothy O'Neal | Actor | 2006 | 1 | |
| Osgood, Erin | Erin Osgood | Actor | 2006 | 1 | |
| Orella, Francesc | Francesc Orella | Actor | 2007 - 2013 | 11 | |
| Oliver, Elinor | Elinor Oliver | Actor | 1922 | 1 | |
| Olvera, Viridiana | Viridiana Olvera | Actor | 2006 | 12 | |
| O'Brien, Patrick | Patrick O'Brien | Actor | 2006 | 1 | |
| Ovčinnikov, Jurij | Jurij Ovčinnikov | Actor | 2007 | 1 | |
| Otani, Ro | Ro Otani | Actor | 2006 | 1 | |
| Owen, Lisa | Lisa Owen | Actor | 2006 | 1 | |
| Oura, Mizuki | Mizuki Oura | Actor | 2006 | 3 | |
| Ontiveros, Montserrat | Montserrat Ontiveros | Actor | 2006 | 2 | |
| Olsen, Tyler | Tyler Olsen | Actor | 2006 | 25 | |
| Okoro, Nija | Nija Okoro | Actor | 2017 | 1 | |
| Oravisto, Matti | Matti Oravisto | Actor | 1968 | 1 | |
| Oury, Gérard | Gérard Oury | Actor | 1954 | 1 | |
| Orth, Franz | Franz Orth | Actor | 2007 | 3 | |
| Oberlik, Katharina | Katharina Oberlik | Actor | 2006 | 1 | |
| Oja, Tõnu | Tõnu Oja | Actor | 2007 - 2022 | 2 | 1 |
| Olympia Pagoulatou, Olympia | Olympia Pagoulatou | Actor | 2006 | 1 | |
| O'Connell, Caitlin | Caitlin O'Connell | Actor | 2006 - 2009 | 2 | 1 |
| O'Connor, Jim | Jim O'Connor | Actor | 2006 | 1 | 1 |
| O'Neill, Luke | Luke O'Neill | Actor | 2006 | 1 | |
| Olekwara, Nnandi | Nnandi Olekwara | Actor | 2002 | 1 | |
| Okoli, Ngozi | Ngozi Okoli | Actor | 2002 | 1 | |
| Ogochukwu, Ikenma | Ikenma Ogochukwu | Actor | 2002 | 1 | |
| Ogochukwu, Uyanwune | Uyanwune Ogochukwu | Actor | 2002 | 1 | |
| Ofobuike, Nwafor | Nwafor Ofobuike | Actor | 2002 | 1 | |
| Ochasi, Onyekachi | Onyekachi Ochasi | Actor | 2002 | 1 | |
| Oboshi, Ebele | Ebele Oboshi | Actor | 2002 | 1 | |
| Okadigwe, Mary | Mary Okadigwe | Actor | 2002 | 1 | |
| Okafor, Kosy | Kosy Okafor | Actor | 2002 | 1 | |
| Okafor, Barnabas | Barnabas Okafor | Actor | 2002 | 1 | |
| Oliveira, Christian Manuel | Christian Manuel Oliveira | Actor | 2006 - 2007 | 4 | |
| O'Brien, Jackie | Jackie O'Brien | Actor | 2006 | 10 | |
| O'Rorke, Elle | Elle O'Rorke | Actor | 2006 | 1 | |
| Ohba, Ai | Ai Ohba | Actor | 2006 - 2009 | 2 | |
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