| Name | Gender | Appearances | Top Performance |
|---|---|---|---|
| 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 |
| Brad Olsen | Male | 1 | 36th |
| Mark Olsen | Male | 1 | 43rd |
| Brendan O'Neill | Male | 10 | 2nd |
| Dick Ongley | Male | 1 | 58th |
| Diedrik Oomens | Male | 1 | 16th |
| Lucas Oomens | Male | 1 | 4th |
| Brianna Orams | Female | 1 | 39th |
| Ron Oranje | Male | 1 | 1st |
| Poppy Orchard | Female | 1 | 9th |
| John O'Regan | Male | 1 | 126th |
| Simon Orgias | Male | 1 | 80th |
| Callum Orman | Male | 3 | 7th |
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