This is the SACE Honour Roll, listing every award, merit or prize won by South Australian SACE students in 2021, along with their school and subject details.
The report also includes significant Australian national awards and prizes such as the Australian Student Prize.
| 372 | Galaeti, Chandana | SA | Merit | Religion Studies | |
| 373 | Gandhara, Anmol | SA | Merit | General Mathematics | |
| 374 | Ganley, Edward | SA | Merit | General Mathematics | |
| 375 | Ganley, James | SA | Merit | Religion Studies | |
| 376 | Ganley, Jordan | SA | Merit | Research Project B | |
| 377 | Garuccio, Tiana | SA | Merit | Health and Wellbeing | |
| 378 | Gasparin, Ava Camille | SA | Merit | English | |
| 379 | Gatto, Charlie | SA | Merit | English | |
| 380 | Gayko, Aleksander | SA | Merit | English | |
| 381 | George, Ashwin Abraham | SA | Merit | Biology | |
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| 382 | George, Holly | SA | Merit | English | |
| 383 | George, Piper | SA | Merit | Research Project B | |
| 384 | Georgopoulos, Patricia | SA | Merit | Creative Arts | |
| 385 | Georgopoulos, Patricia | SA | Merit | General Mathematics | |
| 386 | Gerges, Youssef | SA | Merit | Biology | |
| 387 | Gerges, Youssef | SA | Merit | Chemistry | |
| 388 | Gerges, Youssef | SA | Merit | Research Project B | |
| 389 | Gerhardy, Cameron Rex | SA | Merit | Research Project B | |
| 390 | Gibbs, Lily | SA | Merit | English | |
| 391 | Gingell, Katie Louise | SA | Merit | Food and Hospitality | |
| 392 | Giotis, Emily | SA | Merit | Biology | |
| 393 | Glazier, Aisha Frances | SA | Merit | Psychology | |
| 394 | Glynatsis, Nomiki Maria | SA | Merit | Nutrition | |
| 395 | Goessling, Levi | SA | Merit | Industry and Entrepreneurial Solutions | |
| 396 | Goessling, Levi | SA | Merit | Music Performance - Ensemble | |
| 397 | Goh, Erin Wei Xin | SA | Merit | English | |
| 398 | Goldwyn, Matt Levi Archie | SA | Merit | Legal Studies | |
| 399 | Gomersall, Matthew Jack | SA | Merit | English | |
| 400 | Goode, Sebastian Jon William | SA | Merit | Essential Mathematics | |
| 401 | Goodwin, Joshua Benjamin | SA | Merit | General Mathematics | |
| 402 | Gordon, Ashlyn Jessie | SA | Merit | General Mathematics | |
| 403 | Gordon, Paige | SA | Merit | Biology | |
| 404 | Gormley, Jameson Patrick | SA | Merit | English | |
| 405 | Gorrie, Sam Giorgio Mercurio | SA | Merit | Physics | |
| 406 | Gouskos, Peta | SA | Merit | Essential Mathematics | |
| 407 | Greaves, Millicent Ashlee | SA | Merit | Child Studies | |
| 408 | Gregurev, Grace | Endeavour College | Mawson Lakes | Gov of SA SACE Award | |
| 409 | Grigg, Lachlan David | SA | Merit | Creative Arts | |
| 410 | Grover, Ridheypreet | SA | Merit | Research Project B | |
| 411 | Guerra, Sammi Leigh | SA | Merit | Creative Arts | |
| 412 | Guglielmucci, Lara | SA | Merit | English | |
| 413 | Gunawardane, Hansika Kasundie | SA | Merit | Research Project B | |
| 414 | Gunn, Katelin | Scotch College | Torrens Park | Gov of SA SACE Award | |
| 415 | Gunn, Lily Chanel | SA | Merit | Food and Hospitality | |
| 416 | Gurnett, Abby | SA | Merit | Integrated Learning A | |
| 417 | Guruge, Gihansi Kavinya | SA | Merit | English | |
| 418 | Guruge, Lathika | SA | Merit | Biology | |
| 419 | Guruge, Lathika | SA | Merit | Chemistry | |
| 420 | Guruge, Lathika | SA | Merit | Mathematical Methods | |
| 421 | Guruge, Lathika | SA | Merit | Research Project B | |