This is the SACE Honour Roll, listing every award, merit or prize won by South Australian SACE students in 2020, along with their school and subject details.
The report also includes significant Australian national awards and prizes such as the Australian Student Prize.
| 363 | Gacic, Nikolas | SA | Merit | Research Project B | |
| 364 | Gadomski-Mott, Molly Mia | SA | Merit | Psychology | |
| 365 | Gaertner, Thomas | St Peters College | St Peters | Prize: Australian Institute of Physics Prize - Bronze Bragg Medal | Physics |
| 366 | Galbraith, Joshua | SA | Merit | Research Project B | |
| 367 | Galluccio, Isabella | SA | Merit | Essential Mathematics | |
| 368 | Gardner, Ruby | SA | Merit | Modern History | |
| 369 | Gatter, Cheyann Desma | SA | Merit | Health | |
| 370 | Gauci, Alexandra Kate | SA | Merit | Biology | |
| 371 | Gaufo, Patricia | SA | Merit | Research Project B | |
| 372 | Gawler, Stephanie | SA | Merit | Research Project B | |
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| 373 | Georgaris, Ellie Mary | SA | Merit | Outdoor Education | |
| 374 | Georgi, Kachina Louise | SA | Merit | English | |
| 375 | Gerard, Henry James | SA | Merit | Accounting | |
| 376 | Gilbert, Alice | SA | Merit | Religion Studies | |
| 377 | Gill, Irhas Muhammad | SA | Merit | English | |
| 378 | Gill, Irhas Muhammad | SA | Merit | Mathematical Methods | |
| 379 | Gill, Irhas Muhammad | SA | Merit | Specialist Mathematics | |
| 380 | Gladigau, Aimee Loine | SA | Merit | Visual Arts - Art | |
| 381 | Goh, Zhuo Shan | SA | Merit | Music Explorations | |
| 382 | Goh, Zhuo Shan | SA | Merit | Music Studies | |
| 383 | Golding, Cameron | SA | Merit | Workplace Practices | |
| 384 | Golledge, Liam | SA | Merit | Research Project B | |
| 385 | Gomez, Rhytech | SA | Merit | Research Project B | |
| 386 | Gong, Jason | SA | Merit | Chemistry | |
| 387 | Gonzalez Pinheiro, Ezequiel | SA | Merit | Research Project B | |
| 388 | Goold, Emily | SA | Merit | Business Innovation | |
| 389 | Gordon, Abbie Claire | SA | Merit | Research Project B | |
| 390 | Gordon, Paige | SA | Merit | Research Project B | |
| 391 | Gorpynyak, Maria | SA | Merit | Language and Culture | |
| 392 | Gorrie, Sam Giorgio Mercurio | SA | Merit | Mathematical Methods | |
| 393 | Goss, Daniel James | SA | Merit | Research Project A | |
| 394 | Gough, Hannah | SA | Merit | English Literary Studies | |
| 395 | Gouskos, Peta | SA | Merit | Biology | |
| 396 | Grainger, Grace | SA | Merit | Research Project B | |
| 397 | Gray, Cerys Emily | SA | Merit | Material Solutions | |
| 398 | Green, Callum | SA | Merit | Geography | |
| 399 | Greenfield, Bridie Bethany | SA | Merit | Outdoor Education | |
| 400 | Gregurev, Grace Emily | SA | Merit | Research Project B | |
| 401 | Greig, Charlotte Eva | SA | Merit | Research Project B | |
| 402 | Griffiths, Cloe | SA | Merit | Drama | |
| 403 | Griffiths, Cloe | SA | Merit | Workplace Practices | |
| 404 | Grotto, Anthony Paul | SA | Merit | Mathematical Methods | |
| 405 | Grout, Danielle | SA | Merit | Ancient Studies | |
| 406 | Grover, Meg Hannah | SA | Merit | Child Studies | |
| 407 | Grover, Meg Hannah | SA | Merit | General Mathematics | |
| 408 | Guerrero, Yuan Miguel | SA | Merit | Research Project A | |
| 409 | Guglielmucci, Lara | SA | Merit | Biology | |
| 410 | Guglielmucci, Lara | SA | Merit | Research Project B | |
| 411 | Gulliver, Asha Emily | SA | Merit | Psychology | |
| 412 | Gunn, Chloe Chantelle | SA | Merit | Integrated Learning B | |