| Name | Gender | Appearances | Top Performance |
|---|---|---|---|
| Graham Oberlin-Brown | Male | 2 | 17th |
| Ed OBrien | Male | 1 | 63rd |
| Neil Obrien | Male | 2 | 11th |
| Kevin O'Brien | Male | 1 | 10th |
| Owen O'Brien | Male | 1 | 20th |
| Raewyn O'Brien | Female | 2 | 3rd |
| Steve O'Brien | Male | 3 | 64th |
| Double Ocean Mongrels | Male | 1 | 7th |
| Rachel O'Connell | Female | 4 | 8th |
| Adam O'Connor | Male | 1 | 22nd |
| Jake O'Connor | Male | 0 | - |
| Justin O'Connor | Male | 2 | 9th |
| Corrinne O'Donnell | Female | 1 | 11th |
| Dugan O'Donnell | Male | 2 | 39th |
| Kelso Offenbaker | Male | 1 | 55th |
| Double Oh Eight Og'S | Male | 1 | 6th |
| Clare O'Hagan | Female | 2 | 77th |
| Julian O'Hagan | Male | 1 | 2nd |
| Jo O'Halloran | Female | 1 | 13th |
| Lorelle Ohaloran | Female | 1 | 113th |
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