| O'Dwyer, Larry | Larry O'Dwyer | Director | 1970 | 1 | |
| O'Dwyer, Katherine | Katherine O'Dwyer | Actor | 1922 | 1 | |
| O'Dowd, Spencer | Spencer O'Dowd | Actor | 2008 | 2 | |
| O'Donohue, Nicole | Nicole O'Donohue | Producer | 2015 | 1 | |
| O'Donoghue, James | James O'Donoghue | Actor | 2013 | 1 | |
| O'Donoghue, Brian | Brian O'Donoghue | Lighting Designer | 1980 | 1 | |
| O'Donnell, Vayu | Vayu O'Donnell | Actor | 2005 | 1 | |
| O'Donnell, Seumas | Seumas O'Donnell | Actor | 1936 | 1 | |
| O'Donnell, Penny | Penny O'Donnell | Actor | 1963 | 1 | |
| O'Donnell, Patrick | Patrick O'Donnell | Actor | 2012 | 1 | 3 |
| O'Donnell, Patricia | Patricia O'Donnell | Actor | 1981 | 4 | 1 |
| O'Donnell, Mary Katherine | Mary Katherine O'Donnell | Actor | 2018 | 1 | |
| O'Donnell, Carolyn | Carolyn O'Donnell | Dancer | 1956 | 1 | |
| O'Donnell, Beatrice | Beatrice O'Donnell | Actor | 1981 | 1 | |
| O'Dea, Maureen | Maureen O'Dea | Actor | 1959 | 1 | |
| O'Dea, Dysart | Dysart O'Dea | Actor | 1928 | 1 | |
| O'Dea, Donncha | Donncha O'Dea | Actor | 2013 | 1 | |
| O'Connor, Zach | Zach O'Connor | Actor | 2018 | 1 | |
| O'Connor, Tom | Tom O'Connor | Actor | 2003 | 1 | |
| O'Connor, Tim | Tim O'Connor | Actor | 1949 | 1 | |
| O'Connor, Thom | Thom O'Connor | Composer | 2013 | 1 | |
| O'Connor, Terrence | Terrence O'Connor | Actor | 1963 | 1 | |
| O'Connor, Savannah | Savannah O'Connor | Actor | 2002 | 1 | |
| O'Connor, Peter, Dylan | Peter Dylan O'Connor | Actor | 2013 | 1 | 2 |
| O'Connor, Paul, Vincent | Paul Vincent O'Connor | Actor | 1990 | 3 | |
| O'Connor, Paul | Paul O'Connor | Actor | 1969 | 1 | |
| O'Connor, Myles | Myles O'Connor | Actor | 2010 | 1 | |
| O'Connor, Loyola | Loyola O'Connor | Actor | 1916 | 1 | |
| O'Connor, Leanore | Leanore O'Connor | Actor | 1939 | 1 | |
| O'Connor, Kathleen | Kathleen O'Connor | Actor | 1912 | 1 | |
| O'Connor, Kaleigh | Kaleigh O'Connor | Actor | 2002 | 1 | |
| O'Connor, John | John O'Connor | Director | 2003 | 1 | |
| O'Connor, Joanna | Joanna O'Connor | Actor | 2007 - 2021 | 4 | 1 |
| O'Connor, Jim | Jim O'Connor | Actor | 2006 | 1 | 1 |
| O'Connor, Hugh | Hugh O'Connor | Designer | 2014 | 1 | |
| O'Connor, Herbert | Herbert O'Connor | Actor | 1906 | 1 | |
| O'Connor, Francis | Francis O'Connor | Designer | 2000 | 1 | |
| O'Connor, Frances | Frances O'Connor | Actor | 1994 | 1 | |
| O'Connor, Declan | Declan O'Connor | Actor | 2017 | 1 | |
| O'Connor, Cecile | Cecile O'Connor | Actor | 1973 | 7 | |
| O'Connor, Boardman | Boardman O'Connor | Designer, Lighting Designer | 1961 | 2 | |
| O'Connell, Steve | Steve O'Connell | Actor | 2010 | 1 | |
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