| Otto, Karl | Karl Otto | Actor | 1910 - 1911 | 2 | |
| O'Berski, Jaybird | Jaybird O'Berski | Actor | 2018 | 1 | |
| Opzoomer, India | India Opzoomer | Actor | 2018 | 1 | |
| Orwell, Harry | Harry Orwell | Actor | 2018 | 1 | |
| Ottepp, Alexander | Alexander Ottepp | Actor | 1891 | 1 | |
| O'Connor, Herbert | Herbert O'Connor | Actor | 1906 | 1 | |
| O'Shea, James | James O'Shea | Actor | 1905 | 1 | |
| Ortega, Jessie, Montoya | Jessie Montoya Ortega | Actor | 2018 | 1 | |
| Oakleaf, Donovan | Donovan Oakleaf | Actor | 2018 | 1 | |
| O'Donnell, Mary Katherine | Mary Katherine O'Donnell | Actor | 2018 | 1 | |
| Olson, Andrew | Andrew Olson | Actor | 2018 | 6 | |
| Ono, Toshiaki | Toshiaki Ono | Actor | 2018 | 1 | |
| Ogden, Betty | Betty Ogden | Actor | 1969 - 1972 | 2 | |
| O'Connor, Paul | Paul O'Connor | Actor | 1969 | 1 | |
| Oxley, Matt | Matt Oxley | Actor | 2018 | 1 | |
| Oikonomaki, Grigoria | Grigoria Oikonomaki | Actor | 2018 | 1 | |
| Orchard, Mandy | Mandy Orchard | Actor | 2018 | 1 | |
| Oie, Austin | Austin Oie | Actor | 2016 | 1 | |
| Orr, Grace | Grace Orr | Actor | 2018 | 1 | |
| Ozono, Jyuri | Jyuri Ozono | Actor | 2003 | 1 | |
| Opdyke, Ivy | Ivy Opdyke | Actor | 2018 | 1 | |
| Ossa, Francisco | Francisco Ossa | Actor | 2018 | 1 | |
| Onishi, Ayaka | Ayaka Onishi | Actor | 2018 | 2 | |
| Ohtaka, Akira | Akira Ohtaka | Actor | 2018 | 2 | |
| Owens, Anne Marie | Anne Marie Owens | Actor | 2018 | 1 | |
| Okonkwo, Noble | Noble Okonkwo | Actor | 2019 | 1 | |
| Ortega, Manuel | Manuel Ortega | Actor | 2019 | 1 | |
| Olasz, Lajos | Lajos Olasz | Actor | 1936 | 1 | |
| Oliverić, Andrijana | Andrijana Oliverić | Actor | 2016 | 1 | |
| Ogorevc, Manca | Manca Ogorevc | Actor | 2016 | 1 | |
| Oron, Tamar | Tamar Oron | Actor | 2020 | 2 | |
| Omar, Ala | Ala Omar | Actor | 1990 | 1 | |
| Osman Sozi | Sozi Osman | Actor | 1997 | 1 | |
| Oehler, Gven | Gven Oehler | Actor | 2018 | 1 | |
| Ocina, Gabriel | Gabriel Ocina | Actor | 2018 - 2020 | 2 | |
| Obendorf, Mala | Mala Obendorf | Actor | 1928 | 1 | |
| Orlović, Mara | Mara Orlović | Actor | 1933 | 1 | |
| Orlović, Milan | Milan Orlović | Actor | 1933 | 1 | |
| Orlova, Olga | Olga Orlova | Actor | 1933 | 1 | |
| Ognjenović, Milenko | Milenko Ognjenović | Actor | 1996 | 1 | |
| Ondeck, Chris | Chris Ondeck | Actor | 2020 | 1 | |
| Owen-Taylor, Mark | Mark Owen-Taylor | Actor | 1983 | 1 | |
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