| O'Brien, Peter | Peter O'Brien | Musician | 1982 | 1 | |
| Ottesen, Thorbjørn | Thorbjørn Ottesen | Musician | 1993 - 1994 | 2 | |
| Obata, Machiko | Machiko Obata | Musician | 1993 | 1 | |
| Oscarson, Stina | Stina Oscarson | Musician | 1997 | 1 | |
| Olson, Emerson | Emerson Olson | Musician | 2018 | 1 | |
| Osgood, Dylan | Dylan Osgood | Musician | 2018 | 1 | |
| Omar, Hersh | Hersh Omar | Musician | 2013 - 2014 | 3 | |
| Orii, Akitsu | Akitsu Orii | Musician | 2013 | 1 | |
| Osmani, Blerim | Blerim Osmani (Блерим Османи) | Musician | 2022 | 1 | |
| Oliver, Heather | Heather Oliver | Producer | 2005 | 2 | |
| Ost, Geoffrey | Geoffrey Ost | Producer | 1960 | 1 | |
| Oldfield, Vivienne | Vivienne Oldfield | Producer | 1960 | 1 | |
| O'Donohue, Nicole | Nicole O'Donohue | Producer | 2015 | 1 | |
| Ocaña, Luis | Luis Ocaña | Producer | 1981 | 1 | |
| Oleksikiw, Silvia | Silvia Oleksikiw | Producer | 2022 | 1 | |
| Oriano, Nanouche | Nanouche Oriano | Puppet Designer, Video Designer | 2016 - 2017 | 8 | |
| O’Connor, Francis | Francis O’Connor | Set Designer | 2023 | 1 | |
| Ocampo-Morales, Leo | Leo Ocampo-Morales | Set Designer | 2024 | 1 | |
| Ogasawara, Makoto | Makoto Ogasawara | Sound Designer | 1997 | 1 | |
| Owen, John | John Owen | Sound Designer | 1996 - 1997 | 3 | |
| O’Brien, Fergus | Fergus O’Brien | Sound Designer | 2006 | 9 | |
| Orr, Terence | Terence Orr | Sound Designer | 1975 | 1 | |
| Olsen, Edgar Meyer | Edgar Meyer Olsen | Sound Designer | 1978 | 2 | |
| Olson, Todd | Todd Olson | Sound Designer | 2012 | 1 | |
| Owen, Philip | Philip Owen | Sound Designer | 2013 | 1 | |
| Olsen, Roar, Skau | Roar Skau Olsen | Sound Designer | 2013 | 1 | |
| Oliver, Tim | Tim Oliver | Sound Designer | 1994 - 1995 | 3 | |
| Onizawa, Yoko | Yoko Onizawa | Sound Designer | 1996 | 1 | |
| Owens, John | John Owens | Sound Designer | 2003 | 4 | |
| Obenius, Frej | Frej Obenius | Sound Designer | 2015 | 1 | |
| Okada, Yu | Yu Okada | Sound Designer | 2009 | 1 | |
| Ophaug, Erna | Erna Ophaug | Sound Designer | 1953 - 2006 | 4 | |
| Oyamada, Akira | Akira Oyamada | Sound Designer | 1998 | 1 | |
| Otto, Matt | Matt Otto | Sound Designer | 2017 | 1 | |
| Obara, Makoto | Makoto Obara | Sound Designer | 1990 | 1 | |
| Otremba, Adolf | Adolf Otremba | Translator | 1882 - 1883 | 3 | |
| Ottmann, Victor | Victor Ottmann | Translator | 1901 - 1902 | 9 | 2 |
| Ottolini, Piero | Piero Ottolini | Translator | 1905 - 1906 | 4 | 1 |
| Ohta, Sanjiro | Sanjiro Ohta | Translator | 1914 | 1 | |
| Obuch, Ladislav | Ladislav Obuch | Translator | 1955 - 2021 | 14 | 1 |
| Orthmann, Ruth | Ruth Orthmann | Translator | 1994 | 1 | 1 |
| Oliveira, Vidal de | Vidal de Oliveira | Translator | 1949 - 1994 | 6 | |
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