This is the SACE Honour Roll, listing every award, merit or prize won by South Australian SACE students in 2018, along with their school and subject details.
The report also includes significant Australian national awards and prizes such as the Australian Student Prize.
| 151 | CASAZZA, Nicole | SA | Merit | Research Project B | |
| 152 | CASTINE-PRICE, Jack Ethan | SA | Merit | General Mathematics | |
| 153 | CASTLE, Claudia | SA | Merit | Child Studies | |
| 154 | CATTO, Georgia Rose | SA | Merit | Business and Enterprise | |
| 155 | CAVILL, Hugo Michael | SA | Merit | Research Project B | |
| 156 | CEHIC, Francesca Silvia | SA | Merit | Mathematical Methods | |
| 157 | CENTOFANTI, Nicholas | SA | Merit | Visual Arts - Design | |
| 158 | CESARIO, Laura Louise | SA | Merit | English | |
| 159 | CHAMLAGAI, Mon Maya | SA | Merit | Language and Culture | |
| 160 | CHAN, Jocelyn | SA | Merit | Japanese (Continuers) | |
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| 161 | CHAN, Wen Shin | SA | Merit | General Mathematics | |
| 162 | CHANANA, Saujas | SA | Merit | English | |
| 163 | CHANANA, Saujas | SA | Merit | Legal Studies | |
| 164 | CHARSLEY, Rhiannan Rose | SA | Merit | General Mathematics | |
| 165 | CHEA, Vincent | SA | Merit | Society and Culture | |
| 166 | CHEN, Sonia Luxiao | SA | Merit | Mathematical Methods | |
| 167 | CHEN, Yongyu | SA | Merit | Essential English | |
| 168 | CHENG, Jien Lynn | SA | Merit | Chemistry | |
| 169 | CHENG, Yimeng | SA | Merit | Mathematical Methods | |
| 170 | CHHOUR, Catherine | SA | Merit | English | |
| 171 | CHIA, Jereyllsze Shaun | SA | Merit | Solo Performance | |
| 172 | CHIABRERA, Joseph | SA | Merit | Scientific Studies | |
| 173 | CHIGNOLA, Ardo Rigo Elmo Lio | SA | Merit | Performance Special Study | |
| 174 | CHIU, Karen Kai-Yuet | SA | Merit | English | |
| 175 | CHRISTIE, Olivia | SA | Merit | Research Project B | |
| 176 | CHU, Wing Kwan Hannah | SA | Merit | Biology | |
| 177 | CHUNG, Hao Man | SA | Merit | Research Project B | |
| 178 | CLEARY, Savannah Mae | SA | Merit | Research Project B | |
| 179 | CLOHESY, Alyssa | SA | Merit | Child Studies | |
| 180 | COLANGELO, Thomas | SA | Merit | Material Products I | |
| 181 | COLES, Kristen | SA | Merit | Physics | |
| 182 | Coles, Kristen | Seymour College | Glen Osmond | Prize: Australian Institute of Physics Prize - Bronze Bragg Medal | Physics |
| 183 | Collins, Heidi | Westminster School | Marion | Gov of SA SACE Award | |
| 184 | COLLINS, Heidi Jane | SA | Merit | Outdoor Education | |
| 185 | COMBE, Ellie | SA | Merit | Nutrition | |
| 186 | COMPARE, Olivia | SA | Merit | General Mathematics | |
| 187 | COOK, Lucy Jude | SA | Merit | Research Project B | |
| 188 | COOK, Olivia Chelsea | SA | Merit | Essential English | |
| 189 | COOKE, Danielle | SA | Merit | Research Project B | |
| 190 | Cooke, Danielle | Our Lady of the Sacred Heart College | Enfield | Gov of SA SACE Award | |
| 191 | COOKE, Harry Douglas | SA | Merit | Accounting | |
| 192 | COOKE, Harry Douglas | SA | Merit | Business and Enterprise | |
| 193 | COOTE, Cheyenne | SA | Merit | Research Project B | |
| 194 | CORAM, Ingrid Elizabeth | SA | Merit | Economics | |
| 195 | CORAM, Ingrid Elizabeth | SA | Merit | English Literary Studies | |
| 196 | CORAM, Ingrid Elizabeth | SA | Merit | Legal Studies | |
| 197 | CORCORAN, Bianca Ruby | SA | Merit | Society and Culture | |
| 198 | CORMACK, Chavannah | SA | Merit | Research Project B | |
| 199 | COSTANZO, Marcus | SA | Merit | Business and Enterprise | |
| 200 | COSTI, Jake Jaysen | SA | Merit | Mathematical Methods | |