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.
| 375 | GOODRICH, Ellen Marie | SA | Merit | Modern History | |
| 376 | GORDON, Caitlin | SA | Merit | Integrated Learning A | |
| 377 | GOUSKOS, Dion Anesti | SA | Merit | Accounting | |
| 378 | GOUSKOS, Dion Anesti | SA | Merit | Chemistry | |
| 379 | GOUSKOS, Dion Anesti | SA | Merit | English Literary Studies | |
| 380 | GOUSSIOS, Amy Mary | SA | Merit | English Literary Studies | |
| 381 | GRABAN, Lewis | SA | Merit | Essential English | |
| 382 | GRAHAM, Jenaiha Emma | SA | Merit | Material Products I | |
| 383 | GRAMP, Harrison | SA | Merit | Material Products I | |
| 384 | GRANT, Zack Thomas | SA | Merit | Australian and International Politics | |
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| 385 | GRANT, Zack Thomas | SA | Merit | Economics | |
| 386 | GRAY, Alexandra Ruby | SA | Merit | English | |
| 387 | GRAY, Lucinda Jade | SA | Merit | Society and Culture | |
| 388 | GRBIN, Anna | SA | Merit | Psychology | |
| 389 | GREAR, Victoria Leason | SA | Merit | English | |
| 390 | Greco, Susie | Wilderness School | Medindie | Prize: John Lewis Medal and Prize | Geography |
| 391 | GRECO, Susie Elise | SA | Merit | Geography | |
| 392 | GRECO, Susie Elise | SA | Merit | Mathematical Methods | |
| 393 | GRECO, Susie Elise | SA | Merit | Physics | |
| 394 | GRECO, Susie Elise | SA | Merit | Specialist Mathematics | |
| 395 | GREEN, Natasha | SA | Merit | Research Project B | |
| 396 | GREENFIELD, Anna Charlotte | SA | Merit | Research Project B | |
| 397 | GREENWOOD, Rachel Marie | SA | Merit | Research Project B | |
| 398 | GREET, Sophie Clare | SA | Merit | Research Project B | |
| 399 | GREGUREV, Joel Marc | SA | Merit | Research Project B | |
| 400 | GROOME, Riley Jack | SA | Merit | Mathematical Methods | |
| 401 | GROOME, Riley Jack | SA | Merit | Physics | |
| 402 | GROOME, Riley Jack | SA | Merit | Specialist Mathematics | |
| 403 | GROOME, Tyler James | SA | Merit | Specialist Mathematics | |
| 404 | GURUGE, Kulunu Sewmina | SA | Merit | Biology | |
| 405 | HA, Junwoo | SA | Merit | English as an Additional Language | |
| 406 | HACKETT, Kara Lee | SA | Merit | Communication Products I | |
| 407 | HAGENUS, Whitney Drew | SA | Merit | Research Project B | |
| 408 | HALL, Charlotte Victoria | SA | Merit | Economics | |
| 409 | HAMILTON, Christopher | SA | Merit | Specialist Mathematics | |
| 410 | Hammond, Kieran | Trinity College | Evanston South | Gov of SA SACE Award | |
| 411 | HAMMOND-BROWN, Bonita Jay | SA | Merit | Mathematical Methods | |
| 412 | HAMMOND-BROWN, Bonita Jay | SA | Merit | Physics | |
| 413 | HAN, Jinsu | SA | Merit | English | |
| 414 | HAN, Jinsu | SA | Merit | Ensemble Performance | |
| 415 | HARFORD, Jeremy Hayes | SA | Merit | Economics | |
| 416 | HARPER, Rachel Ruth | SA | Merit | Essential Mathematics | |
| 417 | HARRISON, Rebecca Zoe | SA | Merit | Psychology | |
| 418 | HARTMAN-KEARNS, Skye Peta | SA | Merit | Psychology | |
| 419 | HARTMAN-KEARNS, Skye Peta | SA | Merit | Visual Arts - Art | |
| 420 | HASSAN, Noshin Nusaiba | SA | Merit | Psychology | |
| 421 | HASSAN, Noshin Nusaiba | SA | Merit | Research Project B | |
| 422 | HASSANI, Abolfazl | SA | Merit | Integrated Learning A | |
| 423 | HAYTON, Zachariah | SA | Merit | General Mathematics | |
| 424 | HEALEY, Stella Rhianon | SA | Merit | Visual Arts - Design | |