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.
| 344 | GAFFNEY, Caitlin Claire | SA | Merit | Child Studies | |
| 345 | GAIN, Alice Patricia | SA | Merit | Research Project B | |
| 346 | GALLERY, Amelia | SA | Merit | Dance | |
| 347 | GARRETT, Georgia Scarlett | SA | Merit | Physical Education | |
| 348 | GAWDE, Namrata | SA | Merit | General Mathematics | |
| 349 | GAWDE, Namrata | SA | Merit | Nutrition | |
| 350 | GAZZARD, James Paul | SA | Merit | English | |
| 351 | GHATAURA, Tejaspreet Kaur | SA | Merit | Essential Mathematics | |
| 352 | GIAMEOS, Olivia Effie | SA | Merit | Creative Arts | |
| 353 | Giddings, Matthew | Scotch College | Torrens Park | Gov of SA SACE Award | |
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| 354 | GIDDINGS, Matthew John | SA | Merit | Biology | |
| 355 | GIDDINGS, Matthew John | SA | Merit | Mathematical Methods | |
| 356 | GIDDINGS, Matthew John | SA | Merit | Physics | |
| 357 | GIDDINGS, Matthew John | SA | Merit | Specialist Mathematics | |
| 358 | GIERSCH, Emma | SA | Merit | Child Studies | |
| 359 | GILBERT, Claire | SA | Merit | Religion Studies | |
| 360 | GILBERT, Claire | SA | Merit | Workplace Practices | |
| 361 | GILBERT, Dale Mark | SA | Merit | Research Project B | |
| 362 | GILES, Joshua Anthony | SA | Merit | Research Project B | |
| 363 | GILLAM, Marit Lizzie Knarberg | SA | Merit | Geography | |
| 364 | GIRI, Yash | SA | Merit | Mathematical Methods | |
| 365 | GIRI, Yash | SA | Merit | Research Project B | |
| 366 | GLEN, Ellana Louise | SA | Merit | Child Studies | |
| 367 | GLOEDE, Emily Jayne | SA | Merit | English | |
| 368 | GLOEDE, Emily Jayne | SA | Merit | Workplace Practices | |
| 369 | GOGA, Aisa | SA | Merit | Women's Studies | |
| 370 | GOLDER, Rachael Nicole | SA | Merit | Creative Arts | |
| 371 | GOLDER, Rachael Nicole | SA | Merit | Psychology | |
| 372 | GOLDNEY, Sarah | SA | Merit | English | |
| 373 | GOLDNEY, Sarah | SA | Merit | Research Project B | |
| 374 | GOMEZ, Ruby | SA | Merit | Information Processing and Publishing | |
| 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 | |
| 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 | |