| Name | Gender | Appearances | Top Performance |
|---|---|---|---|
| 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 |
| Maria O'Kane | Female | 1 | 3rd |
| Keely O'Keeffe | Female | 1 | 12th |
| Robson Old | Male | 9 | 3rd |
| Scarlett Old | Female | 13 | 1st |
| Addison O'Leary | Female | 1 | 13th |
| Callum O'Leary | Male | 9 | 11th |
| LyallBay Oli | Male | 4 | 7th |
| Scott Olorenshaw | Male | 1 | 180th |
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