| Name | Functions  | Event Dates | Events | Resources | ||
|---|---|---|---|---|---|---|
| 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 | |||
| Geoffrey Ost | Producer | 1960 | 1 | |||
| Vivienne Oldfield | Producer | 1960 | 1 | |||
| Nicole O'Donohue | Producer | 2015 | 1 | |||
| Luis Ocaña | Producer | 1981 | 1 | |||
| Silvia Oleksikiw | Producer | 2022 | 1 | |||
| Nanouche Oriano | Puppet Designer, Video Designer | 2016 - 2017 | 8 | |||
| Francis O’Connor | Set Designer | 2023 | 1 | |||
| Makoto Ogasawara | Sound Designer | 1997 | 1 | |||
| John Owen | Sound Designer | 1996 - 1997 | 3 | |||
| Fergus O’Brien | Sound Designer | 2006 | 9 | |||
| Terence Orr | Sound Designer | 1975 | 1 | |||
| Edgar Meyer Olsen | Sound Designer | 1978 | 2 | |||
| Todd Olson | Sound Designer | 2012 | 1 | |||
| Philip Owen | Sound Designer | 2013 | 1 | |||
| Roar Skau Olsen | Sound Designer | 2013 | 1 | |||
| Tim Oliver | Sound Designer | 1994 - 1995 | 3 | |||