| SURNAME | GIVEN NAME | PERIOD | TOWN OR PARISH | STATE - COUNTY | COUNTRY | MEMBER No |
| O'BRIEN | James | pre1855 | Loughmore | TIP |
IRL |
181 |
| O'BRIEN | Mary | C1855 | Laggan | NSW |
AUS |
233 |
| O'BRIEN | Thomas | C1860 | Forbes | NSW |
AUS |
181 |
| O'BRIEN | James | 1860 + | Cudal | NSW |
AUS |
181 |
| O'CALLAGHAN | Any | 1854 + | Stawell | VIC |
AUS |
75 |
| O'CALLAGHAN | William | C1819 | Skibberean | COR |
IRL |
75 |
| O'CONNELL | John | 1862 | Sydney | NSW |
AUS |
25 |
| O'CONNOR | Daniel | 1900 + | Greenock | - |
SCT |
23 |
| O'DONOGHUE | Malachi | 1847 + | Combermelon | NSW |
AUS |
75 |
| OGILVIE | Elizabeth | Pre 1807 | Coupar Angus | ANS |
SCT |
128 |
| OGILVY | Elizabeth | Pre 1807 | Coupar Angus | ANS |
SCT |
128 |
| O'HEHIR | Eve Marie | 1882 | Balmain | NSW |
AUS |
227 |
| O'HEHIR | Patrick | 1853 | Bateman's Bay | NSW |
AUS |
227 |
| OLRICK | William | 1857 | Stroud | NSW |
AUS |
372 |
| OLZEN | - | 1880 | Gunning | NSW |
AUS |
28 |
| O'NEILL | Ann / Nancy | C1820 | Clare | CLA |
IRL |
75 |
| ORMAL | Margaret | C1819 | - | - |
IRL |
260 |
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