| Ontiveros, Montserrat | Montserrat Ontiveros | Actor | 2006 | 2 | |
| Onsum, Per | Per Onsum | Actor | 1962 - 1965 | 4 | |
| Onstad, Kari, | Kari Onstad | Actor | 1976 - 2018 | 60 | 5 |
| Onsøjen, Ole, | Ole Onsøjen | Musical Director | 1906 | 1 | |
| Onslow, Michael | Michael Onslow | Actor | 1999 | 30 | |
| Onslow, Alexander | Alexander Onslow | Actor | 1932 | 1 | |
| Onsaker, Maren K., | Maren K. Onsaker (Maren K. Onsaker) | Actor | 1998 | 2 | |
| Onorato, Mr., | Mr. Onorato | Actor | 1893 | 2 | |
| Onofri, Stefano | Stefano Onofri | Actor | 1991 | 1 | |
| Onodera, Shuji | Shuji Onodera | Director | 2013 | 1 | |
| Ono, Y. | Y. Ono | Dramaturg | 2008 - 2009 | 3 | |
| Ono, Toshiaki | Toshiaki Ono | Actor | 2018 | 1 | |
| Ono, Tetsushi | Tetsushi Ono | Actor | 2009 | 1 | |
| Ono, Shihoriko, | Shihoriko Ono | Actor | 1914 | 1 | |
| Ono, Mizuho | Mizuho Ono | Actor | 1997 | 1 | |
| Ono, Masutaro, | Masutaro Ono | Actor | 1913 | 1 | |
| Ono, Hacchaku | Hacchaku Ono | Dramaturg | 2009 | 3 | |
| Ono Seo, Rie | Rie Ono Seo | Lighting Designer | 2009 - 2010 | 2 | |
| Onno, Ferdinand, | Ferdinand Onno | Actor | 1904 - 1938 | 9 | |
| 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 | |
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