| Okafor, Amaka | Amaka Okafor | Actor | 2020 - 2023 | 2 | |
| Oladejo, Oyin | Oyin Oladejo | Actor | 2016 | 1 | |
| Olsen, Kim, Jøran | Kim Jøran Olsen | Actor | 2020 | 1 | |
| Ose, Victoria | Victoria Ose | Actor | 2020 | 2 | |
| Ostrovskaja, Ljubov' | Ljubov' Ostrovskaja | Actor | 2020 | 1 | |
| Olmedo, Christian | Christian Olmedo | Actor | 2019 - 2020 | 2 | |
| Omidi, Hossein | Hossein Omidi | Actor | 2013 | 1 | |
| Omrani, Mohammad | Mohammad Omrani | Actor | 2006 | 1 | |
| Omidi, Elena | Elena Omidi | Actor | 2019 | 1 | |
| Ouzeau, Bruno | Bruno Ouzeau | Actor | 2020 - 2023 | 2 | |
| Olafsson, Emil | Emil Olafsson | Actor | 2020 - 2024 | 2 | |
| Omoto, Luka | Luka Omoto | Actor | 2006 | 1 | |
| Obert, Gerti | Gerti Obert | Actor | 1935 | 1 | |
| Olshin, Abigail | Abigail Olshin | Actor | 2020 | 1 | |
| Orly, Yvonne | Yvonne Orly | Actor | 1935 | 2 | |
| Ortscheidt, Mathilde | Mathilde Ortscheidt | Actor | 2014 - 2015 | 2 | |
| Olivier, Gérard | Gérard Olivier | Actor | 2016 | 1 | |
| Odle, Cliff | Cliff Odle | Actor | 2021 | 1 | |
| Overå, Astrid | Astrid Overå | Actor | 2009 | 1 | |
| Ossowski, Nicolas | Nicolas Ossowski | Actor | 2021 - 2023 | 2 | |
| O'Kane, John | John O'Kane | Actor | 2021 | 1 | |
| Oláh, Vilmos | Vilmos Oláh | Actor | 1988 | 1 | |
| Op de Beeck, Theo | Theo Op de Beeck | Actor | 1961 | 1 | |
| O'Brien, Joseph | Joseph O'Brien | Actor | 1960 | 1 | |
| Osborn, Andrew | Andrew Osborn | Actor | 1951 | 1 | |
| O'Connor, Loyola | Loyola O'Connor | Actor | 1916 | 1 | |
| Ortiz, Gabe | Gabe Ortiz | Actor | 2022 | 1 | |
| Oftebro, Jonas Hoff | Jonas Hoff Oftebro | Actor | 2022 | 1 | |
| Ohlinger, Kristie | Kristie Ohlinger | Actor | 2022 | 1 | |
| O'Farrell, Noémie | Noémie O'Farrell | Actor | 2022 | 2 | |
| Omerović, Aldin | Aldin Omerović | Actor | 2022 | 1 | |
| Orozco, Carolina | Carolina Orozco | Actor | 2022 | 1 | |
| Ortenzi, Oriana | Oriana Ortenzi | Actor | 2022 - 2024 | 2 | |
| Ou, Daisy | Daisy Ou | Actor | 2022 | 1 | |
| Olsen, Brian | Brian Olsen | Actor | 2022 | 2 | |
| O'Brien, Meredith | Meredith O'Brien | Actor | 2022 | 1 | |
| Ooi, Mike | Mike Ooi | Actor | 2022 | 1 | |
| Ošavkova, Sonja | Sonja Ošavkova (Соња Ошавкова) | Actor | 2013 | 1 | |
| Olivar, Mr | Mr Olivar | Actor | 1900 | 2 | |
| Ouisem, Abdellaoui | Abdellaoui Ouisem | Actor | 2022 | 1 | |
| Oteyza, Ramón | Ramón Oteyza | Actor | 1975 | 1 | |
| Olier, Luz | Luz Olier | Actor | 2016 | 8 | |
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