| 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 | |
| Ouellette, Jean-Sébastien | Jean-Sébastien Ouellette | Actor | 2009 - 2022 | 3 | 1 |
| O'Rourke, Kristen | Kristen O'Rourke | Actor | 2009 | 1 | |
| O'Neill, Michelle | Michelle O'Neill | Actor | 2008 | 3 | |
| Odum, Henry | Henry Odum | Actor | 2009 | 1 | |
| O'Brien, Barret | Barret O'Brien | Actor | 2008 | 1 | |
| Oja, Totti | Totti Oja | Actor | 2008 | 1 | |
| Ortolani, Philip | Philip Ortolani | Actor | 2008 | 1 | |
| O'Shaughnessy, Fiona | Fiona O'Shaughnessy | Actor | 2008 | 2 | |
| Orsini, Elena | Elena Orsini | Actor | 2016 - 2017 | 11 | |
| Oberheide, Alex | Alex Oberheide | Actor | 2008 | 1 | |
| O'Shea, Ryan | Ryan O'Shea | Actor | 2008 | 1 | |
| Omdal, Adrian | Adrian Omdal | Actor | 2016 - 2017 | 2 | |
| Ottersen, Kyrre, Eikås | Kyrre Eikås Ottersen | Actor | 2004 - 2016 | 10 | |
| Obi, Christopher | Christopher Obi | Actor | 2008 | 2 | |
| Ohloff, Hans | Hans Ohloff | Actor | 1939 | 1 | |
| Orr, Connie | Connie Orr | Actor | 1965 | 1 | |
| O'Dowd, Spencer | Spencer O'Dowd | Actor | 2008 | 2 | |
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