| Name | Gender | Appearances | Top Performance |
|---|---|---|---|
| Poppy Orchard | Female | 1 | 9th |
| John O'Regan | Male | 1 | 126th |
| Callum Orman | Male | 3 | 7th |
| Lachlan Orman | Male | 2 | 8th |
| Rory Orman | Male | 6 | 2nd |
| Scott Orman | Male | 8 | 36th |
| Amaia Osaba | Female | 1 | 60th |
| Aaron Osborne | Male | 9 | 14th |
| Alena Osborne | Female | 1 | 2nd |
| Charlotte Osborne | Female | 1 | 8th |
| Lincoln Osborne | Male | 1 | 7th |
| Will Osborne | Male | 1 | 13th |
| Sommer O'Shea | Female | 6 | 10th |
| Double Oskar | Male | 1 | 2nd |
| Double Oskar And Robbie | Male | 2 | 3rd |
| Sasha Ossowski | Male | 1 | 89th |
| Peter O'Sullivan | Male | 2 | 4th |
| Jay Otto | Male | 1 | 12th |
| Steven Outwin | Male | 5 | 35th |
| Rolph Overvliet | Male | 1 | 117th |
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