| O'Brien, Shelley | Shelley O'Brien | Actor | 2005 | 7 | |
| O'Brien, Sylvia | Sylvia O'Brien | Actor | 1981 | 1 | |
| O'Brien, Terence | Terence O'Brien | Actor | 1917 | 1 | |
| O'Brien, Timothy | Timothy O'Brien | Costume Designer, Designer | 1964 - 1996 | 12 | |
| O'Brien, Tony | Tony O'Brien | Actor | 1993 | 1 | |
| O'Byrne, Adam | Adam O'Byrne | Actor | 2002 | 1 | |
| O'Byrne, Peter | Peter O'Byrne | Actor | 2013 | 1 | |
| O'Callaghan, Brenainn | Brenainn O'Callaghan | Actor | 2000 | 1 | |
| O'Callaghan, Maurice | Maurice O'Callaghan | Actor | 1972 | 1 | |
| O'Callaghan, Tony | Tony O'Callaghan | Actor | 2004 | 1 | 1 |
| O'Clery, Joan | Joan O'Clery | Costume Designer | 2000 - 2013 | 6 | 1 |
| O'Connell Bak, Dennis | Dennis O'Connell Bak | Actor | 2006 | 1 | |
| O'Connell, Alice | Alice O'Connell | Actor | 1940 | 2 | |
| O'Connell, Caitlin | Caitlin O'Connell | Actor | 2006 - 2009 | 2 | 1 |
| O'Connell, Carol | Carol O'Connell | Actor | 1963 | 1 | |
| O'Connell, Dan | Dan O'Connell | Actor, Director | 1943 - 1961 | 2 | |
| O'Connell, Deirdre | Deirdre O'Connell | Actor, Director | 1971 - 1985 | 6 | |
| O'Connell, Hans | Hans O'Connell | Actor | 1966 | 1 | |
| O'Connell, Janine | Janine O'Connell | Actor | 1971 | 1 | |
| O'Connell, Moya | Moya O'Connell | Actor, Director | 2012 - 2024 | 2 | 1 |
| O'Connell, Patricia | Patricia O'Connell | Actor | 1975 - 2000 | 2 | |
| O'Connell, Patrick | Patrick O'Connell | Actor | 1999 | 1 | 1 |
| O'Connell, Richard | Richard O'Connell | Director | 1947 | 2 | |
| O'Connell, Robert, A. | Robert A. O'Connell | Director | 2003 | 1 | |
| O'Connell, Steve | Steve O'Connell | Actor | 2010 | 1 | |
| O'Connor, Boardman | Boardman O'Connor | Designer, Lighting Designer | 1961 | 2 | |
| O'Connor, Cecile | Cecile O'Connor | Actor | 1973 | 7 | |
| O'Connor, Declan | Declan O'Connor | Actor | 2017 | 1 | |
| O'Connor, Frances | Frances O'Connor | Actor | 1994 | 1 | |
| O'Connor, Francis | Francis O'Connor | Designer | 2000 | 1 | |
| O'Connor, Herbert | Herbert O'Connor | Actor | 1906 | 1 | |
| O'Connor, Hugh | Hugh O'Connor | Designer | 2014 | 1 | |
| O'Connor, Jim | Jim O'Connor | Actor | 2006 | 1 | 1 |
| O'Connor, Joanna | Joanna O'Connor | Actor | 2007 - 2021 | 4 | 1 |
| O'Connor, John | John O'Connor | Director | 2003 | 1 | |
| O'Connor, Kaleigh | Kaleigh O'Connor | Actor | 2002 | 1 | |
| O'Connor, Kathleen | Kathleen O'Connor | Actor | 1912 | 1 | |
| O'Connor, Leanore | Leanore O'Connor | Actor | 1939 | 1 | |
| O'Connor, Loyola | Loyola O'Connor | Actor | 1916 | 1 | |
| O'Connor, Myles | Myles O'Connor | Actor | 2010 | 1 | |
| O'Connor, Paul | Paul O'Connor | Actor | 1969 | 1 | |
| O'Connor, Paul, Vincent | Paul Vincent O'Connor | Actor | 1990 | 3 | |
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