| 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 | |
| O'Rourke, Kristen | Kristen O'Rourke | Actor | 2009 | 1 | |
| O'Connor, Isabell, Monk | Isabell Monk O'Connor | Actor | 2008 | 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 | 2 | |
| 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 | |
| Okubo, Ryoichi | Ryoichi Okubo | Actor | 2008 | 1 | |
| Olt, Edgar | Edgar Olt | Actor | 1955 | 3 | |
| Otenbacher, Margot | Margot Otenbacher | Actor | 1959 | 1 | |
| Ostendorf, Josef | Josef Ostendorf | Actor | 1991 - 2016 | 8 | |
| Orlac, Stephan | Stephan Orlac | Actor | 1966 | 2 | |
| Olsen, Tim | Tim Olsen | Actor | 2009 | 1 | |
| Ohkuwa, Akane | Akane Ohkuwa | Actor | 2009 | 1 | |
| O'Neill, Vincent | Vincent O'Neill | Actor | 2009 | 1 | |
| Okukawa, Koji | Koji Okukawa | Actor | 2008 - 2010 | 5 | |
| Otterson, William | William Otterson | Actor | 2009 | 1 | |
| Ohkawa, Minako | Minako Ohkawa | Actor | 2008 - 2009 | 6 | |
| Ortiz, Joanna | Joanna Ortiz | Actor | 2008 | 1 | |
| Ott, Karl | Karl Ott | Actor | 1880 - 1893 | 3 | |
| Ott, Gisela | Gisela Ott | Actor | 1889 | 1 | |
| Ohrnberger, Jörg | Jörg Ohrnberger | Actor | 2010 | 6 | |
| Ozora, Mayumi | Mayumi Ozora | Actor | 2010 | 16 | |
| O'Connor, Myles | Myles O'Connor | Actor | 2010 | 1 | |
| Olpin, Jay | Jay Olpin | Actor | 2010 | 1 | |
| Onishi, Akane | Akane Onishi | Actor | 2010 | 1 | |
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