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.
| 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 | |
| 201 | COTTON, Ella | SA | Merit | Essential Mathematics | |
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| 202 | COWLES, Paige Georgia | SA | Merit | Research Project B | |
| 203 | COWLEY, Kate | SA | Merit | Research Project B | |
| 204 | COWLING, William Arthur | SA | Merit | Biology | |
| 205 | COWLING, William Arthur | SA | Merit | Mathematical Methods | |
| 206 | COYLE, Angus | SA | Merit | Research Project B | |
| 207 | CRAIG, Oliver James | SA | Merit | Research Project B | |
| 208 | CRAIG, Sahara | SA | Merit | Material Products I | |
| 209 | CRAWFORD, Katelyn Melinda | SA | Merit | Composing and Arranging | |
| 210 | CRAWFORD, Lachlan | SA | Merit | Chemistry | |
| 211 | CRETTENDEN, Olivia Nicole | SA | Merit | Creative Arts | |
| 212 | CROCKER, Jasmine | SA | Merit | General Mathematics | |
| 213 | CROPLEY, Daniel Haywood | SA | Merit | English Literary Studies | |
| 214 | CROPLEY, Daniel Haywood | SA | Merit | Psychology | |
| 215 | CROSS, Bethany | SA | Merit | Biology | |
| 216 | CROSS, Bethany | SA | Merit | English Literary Studies | |
| 217 | CROSS, Bethany | SA | Merit | Physics | |
| 218 | Cross, Bethany | St Peters Girls School | Stonyfell | Gov of SA SACE Award | |
| 219 | Crowden, Caleb | Temple Christian College Mile End Campus | Mile End | Gov of SA SACE Award | |
| 220 | CROWLEY, Tate James | SA | Merit | Physics | |
| 221 | CULLEN, Emily | SA | Merit | Essential Mathematics | |
| 222 | CURNOW, Tahlia | SA | Merit | English | |
| 223 | CUSTODIO, Paula Andrea | SA | Merit | Integrated Learning A | |
| 224 | CZECHOWICZ, Adele Iris | SA | Merit | Research Project B | |
| 225 | D'ORTENZIO, Luke Harrison | SA | Merit | English | |
| 226 | DAISH, Georgie Rose | SA | Merit | Biology | |
| 227 | DAISH, Georgie Rose | SA | Merit | Chemistry | |
| 228 | DAISH, Georgie Rose | SA | Merit | General Mathematics | |
| 229 | DALIDOWICZ, Jade | SA | Merit | Visual Arts - Art | |
| 230 | DALKOS, Eleni | SA | Merit | Research Project B | |
| 231 | DALLIMORE, Jasmine | SA | Merit | Society and Culture | |
| 232 | DALWOOD, Oliver | SA | Merit | Workplace Practices | |
| 233 | DAMA, Alethea Laura | SA | Merit | Research Project B | |
| 234 | DANG, Huynh Bao Chau | SA | Merit | Vietnamese (Background Speakers) | |
| 235 | DANG-HUYNH, Liam Phi | SA | Merit | Psychology | |
| 236 | DANIEL, Sasha Helen | SA | Merit | Food and Hospitality | |
| 237 | DASONDI, Aatmaj Shivam | SA | Merit | Chemistry | |
| 238 | DASONDI, Aatmaj Shivam | SA | Merit | General Mathematics | |
| 239 | DASONDI, Aatmaj Shivam | SA | Merit | Physics | |
| 240 | DAVID, Sheryl Ramona | SA | Merit | Research Project B | |
| 241 | DAVIDSON, Kitty Kalpa | SA | Merit | Modern History | |