| 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 | |
| Olteanu , Stefan | Stefan Olteanu | Actor | 2022 | 1 | |
| Oliva, Mr. | Mr. Oliva | Actor | 1893 | 1 | |
| Orjas, José | José Orjas | Actor | 1968 | 1 | |
| Olsson, Erik | Erik Olsson | Actor | 2022 | 1 | |
| Odegaard, Elin | Elin Odegaard | Actor | 2023 | 1 | |
| Onaodowan, Okierite | Okierite Onaodowan | Actor | 2023 | 1 | |
| Occomore, Nye | Nye Occomore | Actor | 2023 | 1 | |
| O'Neil, Rebecca Pugh Parker | Rebecca Pugh Parker O'Neil | Actor | 2023 | 1 | |
| Osokin, Evgeny | Evgeny Osokin (Евгений Осокин) | Actor | 2021 | 1 | |
| Okehurst, Katie | Katie Okehurst | Actor | 2022 | 1 | |
| Ordóñez, María | María Ordóñez | Actor | 2023 | 1 | |
| Owen, Dan | Dan Owen | Actor | 2021 | 1 | |
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