| Name | Functions  | Event Dates | Events | Resources | ||
|---|---|---|---|---|---|---|
| Samo Oblokar | Lighting Designer | 2010 - 2012 | 3 | |||
| Pat O'Sullivan | Lighting Designer | 1964 | 1 | |||
| O. Ostrižnaja | Lighting Designer | 1999 - 2000 | 2 | |||
| Trisha O´Donnell | Lighting Designer | 1981 | 1 | |||
| Driscoll Otto | Lighting Designer | 2018 | 1 | |||
| Haval Omar | Lighting Designer | 1997 | 1 | |||
| Martin Oakley | Lighting Designer | 2021 | 1 | |||
| Carolina Ortiz | Lighting Designer | 2022 | 1 | |||
| Sergey Ozeran | Lighting Designer | 2020 | 1 | |||
| Koji Osako (大迫浩二) | Lighting Designer | 2023 | 2 | |||
| Simona Ornaghi | Lighting Designer | 2018 | 2 | |||
| Georg Ochsenbauer | Lighting Designer, Sound Designer | 2016 | 2 | |||
| Anna Olofson | Mask Maker | 2006 - 2010 | 58 | |||
| Sandra Ortmann | Mask Maker | 1996 | 1 | |||
| Heidemarie Otte | Mask Maker | 2002 | 1 | |||
| Gabriele Oelsch | Mask Maker | 2003 | 1 | |||
| Laura Ozier | Mask Maker | 2000 - 2004 | 13 | |||
| Johannes Ohla | Mask Maker | 1992 | 1 | |||
| Axel Orlia | Mask Maker | 1993 | 1 | |||
| Ole Onsøjen | Musical Director | 1906 | 1 | |||
| Michael O'Flaherty | Musical Director | 1984 | 1 | |||
| Keith O'Brien | Musical Director | 2016 - 2019 | 2 | |||
| João Ricardo Barros Oliveira | Musical Director, Sound Designer | 2002 - 2021 | 4 | |||
| Nasra Ali Omar | Musician | 2006 | 1 | |||
| Leif Osen | Musician | 2009 | 1 | |||
| Halvor Ovenstrøm | Musician | 2013 | 1 | |||
| Arild Ovrum | Musician | 2013 | 1 | |||
| Diane Orson | Musician | 1975 | 1 | |||
| Otto Osterwalder | Musician | 1939 | 1 | |||
| Pavel Ocampo | Musician | 2006 | 2 | |||
| Steinar Ofsdal | Musician | 1978 | 38 | 1 | ||
| Eyvind Olsen | Musician | 1976 | 1 | |||
| Peter O'Brien | Musician | 1982 | 1 | |||
| Thorbjørn Ottesen | Musician | 1993 - 1994 | 2 | |||
| Machiko Obata | Musician | 1993 | 1 | |||
| Stina Oscarson | Musician | 1997 | 1 | |||
| Emerson Olson | Musician | 2018 | 1 | |||
| Dylan Osgood | Musician | 2018 | 1 | |||
| Hersh Omar | Musician | 2013 - 2014 | 3 | |||
| Akitsu Orii | Musician | 2013 | 1 | |||
| Blerim Osmani (Блерим Османи) | Musician | 2022 | 1 | |||
| Heather Oliver | Producer | 2005 | 2 | |||