| Olding, Federico | Federico Olding | Actor | 1980 | 3 | |
| Oliveira, María Clara | María Clara Oliveira | Actor | 2024 | 1 | |
| Otieno, Mercy Dorcas | Mercy Dorcas Otieno | Actor | 2021 | 2 | |
| Obinu, Gianfranco Onatziro | Gianfranco Onatziro Obinu | Actor | 2015 - 2019 | 3 | |
| Ori, Benedetta | Benedetta Ori | Actor | 1999 | 2 | |
| Orlandini, Veronica | Veronica Orlandini | Actor | 2015 | 1 | |
| Olivari, Michela | Michela Olivari | Actor | 2018 | 1 | |
| Olmedo, Darinka | Darinka Olmedo | Actor | 2024 | 1 | |
| Owen, Constance | Constance Owen | Actor | 2024 | 1 | |
| Otrębski , Grzegorz | Grzegorz Otrębski | Actor | 2022 | 1 | |
| Otterson, Jed | Jed Otterson | Actor | 2024 | 1 | |
| O’Leary, Helen | Helen O’Leary | Actor | 2018 | 1 | |
| Owen, Brett | Brett Owen | Actor | 2025 | 1 | |
| Orgler, Wolfgang | Wolfgang Orgler | Actor | 2024 | 1 | |
| Oshinari, Shugo | Shugo Oshinari (忍成修吾) | Actor | 2022 | 2 | |
| Otaka, Akira | Akira Otaka (大鷹明良) | Actor | 2022 | 2 | |
| Okolovich, Niko | Niko Okolovich | Actor | 2025 | 1 | |
| Ousachi, Maya | Maya Ousachi | Actor | 2025 | 1 | |
| Okada, Takanari | Takanari Okada (岡田隆成) | Actor | 2025 | 1 | |
| O’Bryon-Champlin, Katie | Katie O’Bryon-Champlin | Actor | 2025 | 1 | |
| Oei, Melissa | Melissa Oei | Actor | 2025 | 2 | |
| Orozco, Pablo | Pablo Orozco | Actor | 2024 | 3 | |
| Orynbaj, Ajši | Ajši Orynbaj (Айши Орынбай) | Actor | 2025 | 1 | |
| Ocampo, Sebastian | Sebastian Ocampo | Actor | 2025 | 1 | |
| Obasi, Chuk | Chuk Obasi | Actor | 2024 | 1 | |
| Omeñaca, Jaime | Jaime Omeñaca | Actor | 2025 | 1 | |
| Oxales, Johncen | Johncen Oxales | Actor | 2025 | 1 | |
| Owens, Ciarán | Ciarán Owens | Actor | 2025 | 1 | |
| Oswald, Karin | Karin Oswald | Actor, Adaptation | 2007 | 2 | |
| Op gen Orth, Helga | Helga Op gen Orth | Actor, Adaptation, Director | 1992 - 1996 | 4 | |
| Ohshima, Nobuhisa | Nobuhisa Ohshima | Actor, Adaptation, Director | 1994 | 3 | |
| Olson, Niclas | Niclas Olson | Actor, Adaptation, Director | 2017 | 3 | |
| Oliveira, Domingos, José Soares de | Domingos José Soares de Oliveira | Actor, Adaptation, Director, Lighting Designer, Sound Designer, Translator | 1983 - 1998 | 15 | |
| Opstad, Peder | Peder Opstad | Actor, Adaptation, Director, Producer | 2005 - 2010 | 183 | |
| Odeen-Isbister, Sara | Sara Odeen-Isbister | Actor, Adapter | 2020 - 2025 | 3 | |
| Olinescu, Boris | Boris Olinescu | Actor, Assistant Director | 1959 | 2 | |
| O'Mahoney, Robert | Robert O'Mahoney | Actor, Author | 1982 - 1991 | 10 | |
| O’Connell, Sara | Sara O’Connell | Actor, Choreographer, Dancer | 2004 | 4 | |
| Olsen, Ole | Ole Olsen | Actor, Composer | 1895 - 1922 | 18 | 2 |
| Olsen, Max | Max Olsen | Actor, Composer | 1987 | 2 | |
| Oliver, Stephen | Stephen Oliver | Actor, Composer | 1977 - 2024 | 10 | |
| Osazuwa, Evelyn, Rasmussen | Evelyn Rasmussen Osazuwa | Actor, Composer | 2018 - 2019 | 4 | |
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