| Onizawa, Yoko | Yoko Onizawa | Sound Designer | 1996 | 1 | |
| Onishi, Ayaka | Ayaka Onishi | Actor | 2018 | 2 | |
| Onishi, Akane | Akane Onishi | Actor | 2010 | 1 | |
| Oniga, Laurian | Laurian Oniga | Designer | 1985 | 3 | |
| Ongyerth, Gust | Gust Ongyerth | Director | 1940 | 1 | |
| Ongota, Beverley | Beverley Ongota | Actor | 2011 | 1 | |
| Ongley, Warwick | Warwick Ongley | Director | 1969 | 1 | |
| Ongjerth, Zsuzsanna | Zsuzsanna Ongjerth | Actor | 1960 | 1 | |
| Ongjerth, Richárd | Richárd Ongjerth | Actor | 1960 | 1 | |
| Onetto, Elvira | Elvira Onetto | Actor | 2009 - 2011 | 13 | |
| Ones, Arvid | Arvid Ones | Actor, Director | 1983 - 2004 | 22 | |
| Onegin, Andrei | Andrei Onegin | Designer | 2009 | 1 | |
| Ondruch, Pavel | Pavel Ondruch | Director | 2016 | 1 | |
| Ondříček, Antonín | Antonín Ondříček | Actor | 1948 | 1 | |
| Ondrejková, Bibiana | Bibiana Ondrejková | Actor | 1999 | 1 | |
| Ondrášek, Peter | Peter Ondrášek | Actor | 2011 | 1 | |
| Ondráčková, Danuše | Danuše Ondráčková | Actor | 1984 | 2 | |
| Ondra, Tilde | Tilde Ondra | Actor | 1932 | 1 | |
| Ondra, Otto | Otto Ondra | Actor | 1989 | 1 | |
| Ondra, - | - Ondra | Actor | 1928 | 1 | |
| Ondeck, Chris | Chris Ondeck | Actor | 2020 | 1 | |
| Onay, Yılmaz | Yılmaz Onay (Yilmaz Onay) | Translator | 2007 | 1 | |
| Onat, Cigdem | Cigdem Onat | Director | 2005 | 1 | |
| Onaityte, Jurate | Jurate Onaityte | Actor | 1998 - 2000 | 4 | |
| Ona, Bjørn | Bjørn Ona | Actor | 1985 | 1 | |
| Omundson, Timothy | Timothy Omundson | Actor | 1990 | 1 | |
| Omundi, Geoffrey | Geoffrey Omundi | Actor | 2011 | 1 | |
| Omrani, Mohammad | Mohammad Omrani | Actor | 2006 | 1 | |
| Omoto, Luka | Luka Omoto | Actor | 2006 | 1 | |
| Omori, Naomi | Naomi Omori | Actor | 2010 | 1 | |
| Omodei, Raymond | Raymond Omodei | Designer, Director | 1974 - 2001 | 5 | |
| Omnéus, Göran | Göran Omnéus | Actor | 1976 | 2 | |
| Omland, Tone | Tone Omland | Actor | 1996 - 2013 | 2 | |
| Omland, Marit Pedersen | Marit Pedersen Omland | Actor | 1993 | 6 | |
| Omidi, Hossein | Hossein Omidi | Actor | 2013 | 1 | |
| Omidi, Elena | Elena Omidi | Actor | 2019 | 1 | |
| Omid, Arman | Arman Omid | Actor | 1999 | 1 | |
| Omerović, Aldin | Aldin Omerović | Actor | 2022 | 1 | |
| Omdal, Odin Hørthe | Odin Hørthe Omdal | Actor | 1995 - 1999 | 2 | |
| Omdal, Leif | Leif Omdal | Actor | 1935 - 1956 | 4 | |
| Omdal, Adrian | Adrian Omdal | Actor | 2016 - 2017 | 2 | |
| Ombuen, Gianfranco | Gianfranco Ombuen | Actor | 1969 | 2 | |
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