| Ortscheidt, Mathilde | Mathilde Ortscheidt | Actor | 2014 - 2015 | 2 | |
| Ott, Friederike | Friederike Ott | Actor | 2014 - 2016 | 12 | |
| O’Brien, Peter | Peter O’Brien | Costume Designer | 2015 | 1 | |
| Orvik, Karianne | Karianne Orvik | Actor | 2015 | 1 | |
| Obenius, Frej | Frej Obenius | Sound Designer | 2015 | 1 | |
| Ohl, Jessica | Jessica Ohl | Actor | 2015 | 1 | |
| Ofner, Herwig | Herwig Ofner | Actor | 2015 | 1 | |
| O'Riordan, Rachel | Rachel O'Riordan | Director | 2015 | 1 | |
| O'Donohue, Nicole | Nicole O'Donohue | Producer | 2015 | 1 | |
| Olwagen, Christiaan | Christiaan Olwagen | Adaptation, Director | 2015 - 2016 | 4 | |
| Ognyanova, Rositsa | Rositsa Ognyanova | Actor | 2015 - 2016 | 2 | |
| Ostapenko, Alexandra | Alexandra Ostapenko | Actor | 2015 - 2022 | 2 | |
| O’Rowe, Mark | Mark O’Rowe | Adaptation, Director | 2015 - 2023 | 2 | |
| Ortiz, Francisco | Francisco Ortiz | Actor | 2016 | 1 | |
| Ochsenbauer, Georg | Georg Ochsenbauer | Lighting Designer, Sound Designer | 2016 | 2 | |
| Ortmann, Reinar | Reinar Ortmann | Dramaturg | 2016 | 1 | |
| Orr-Ewing, Alice | Alice Orr-Ewing | Actor | 2016 | 1 | |
| Oliver, Julie | Julie Oliver | Actor | 2016 | 1 | |
| O'Rowe, Mark | Mark O'Rowe | Adaptation | 2016 | 1 | |
| Oakes, Andrew | Andrew Oakes | Actor | 2016 | 1 | |
| Owens, Geoffrey | Geoffrey Owens | Actor | 2016 | 1 | |
| Oschmann, Robert | Robert Oschmann | Actor | 2016 | 1 | |
| Orozco, Hiram Alexander | Hiram Alexander Orozco | Costume Designer | 2016 | 1 | |
| Ondruch, Pavel | Pavel Ondruch | Director | 2016 | 1 | |
| Osmelak, Mariusz | Mariusz Osmelak | Actor | 2016 | 1 | |
| Ogawa, Atsuko | Atsuko Ogawa | Actor | 2016 | 1 | |
| Orbán, Levente | Levente Orbán | Actor | 2016 | 2 | |
| Oie, Austin | Austin Oie | Actor | 2016 | 1 | |
| Oliverić, Andrijana | Andrijana Oliverić | Actor | 2016 | 1 | |
| Ogorevc, Manca | Manca Ogorevc | Actor | 2016 | 1 | |
| Oladejo, Oyin | Oyin Oladejo | Actor | 2016 | 1 | |
| Osipova, Nadežda | Nadežda Osipova | Designer | 2016 | 1 | |
| Olivier, Gérard | Gérard Olivier | Actor | 2016 | 1 | |
| Olier, Luz | Luz Olier | Actor | 2016 | 8 | |
| Orsini, Elena | Elena Orsini | Actor | 2016 - 2017 | 2 | |
| Omdal, Adrian | Adrian Omdal | Actor | 2016 - 2017 | 2 | |
| Oriano, Nanouche | Nanouche Oriano | Puppet Designer, Video Designer | 2016 - 2017 | 8 | |
| Okito, Takashi | Takashi Okito | Actor | 2016 - 2018 | 4 | |
| O'Brien, Keith | Keith O'Brien | Musical Director | 2016 - 2019 | 2 | |
| Okoro, Nija | Nija Okoro | Actor | 2017 | 1 | |
| Ortmann, Lucie | Lucie Ortmann | Dramaturg | 2017 | 1 | |
| Onyejekwe, Uton | Uton Onyejekwe | Actor | 2017 | 1 | |
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