| Name | Gender | Appearances | Top Performance |
|---|---|---|---|
| Kevin Coombes | Male | 2 | 10th |
| Calum Coombs | Male | 1 | 50th |
| Illinois Cooney | Male | 1 | 89th |
| Garren Cooper | Male | 2 | 7th |
| Jack Cooper | Male | 1 | 18th |
| John Cooper | Male | 10 | 22nd |
| Hudson Cooper-Ross | Male | 1 | 26th |
| Richard Copus | Male | 1 | 73rd |
| Peter Corbishley | Male | 3 | 78th |
| Carola Cordes | Female | 1 | 116th |
| Shanel Cornille | Female | 2 | 16th |
| Tim Cornish | Male | 1 | 29th |
| Kraig Cornwall | Male | 1 | 21st |
| Albert Corominas | Male | 1 | 18th |
| Solomon Costa | Male | 1 | 30th |
| Katelyn Costello | Female | 5 | 26th |
| Reuben Costello | Male | 5 | 20th |
| Peter Costelo | Male | 2 | 73rd |
| César Cota | Male | 1 | 36th |
| Darryl Cotton | Male | 4 | 23rd |
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