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.
| 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 | |
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| 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 | |
| 422 | Guzej, Mia Amelie | SA | Merit | Visual Arts - Art | |
| 423 | Habel, Lily Louise | SA | Merit | English | |
| 424 | Haddad, Joanna Catherine | SA | Merit | Society and Culture | |
| 425 | Haddad, Ky | SA | Merit | General Mathematics | |
| 426 | Haines-Hann, Lizzie Tate | SA | Merit | Workplace Practices | |
| 427 | Hall, Lucy Annie Mary | SA | Merit | Food and Hospitality | |
| 428 | Hambidge-Hay, William | SA | Merit | Integrated Learning A | |
| 429 | Hamlyn, Ethan Glenn | SA | Merit | Research Project B | |
| 430 | Hanley, Jake | SA | Merit | Information Processing and Publishing | |
| 431 | Hansberry, Millah Rose | SA | Merit | Material Solutions | |
| 432 | Hansen, Ryley Cameron | SA | Merit | General Mathematics | |
| 433 | Haracic, Danny | SA | Merit | Mathematical Methods | |
| 434 | Hardwarewala, Hussain | SA | Merit | Integrated Learning A | |
| 435 | Harris, Mia Mae | SA | Merit | Psychology | |
| 436 | Harris, Thomas | SA | Merit | English Literary Studies | |
| 437 | Hart, Annabel Rose | SA | Merit | Mathematical Methods | |
| 438 | Harvey, Ashleigh | SA | Merit | General Mathematics | |
| 439 | Hastings, Abbey | SA | Merit | Visual Arts - Design | |
| 440 | Hauptman, Emma | SA | Merit | Research Project B | |
| 441 | Hayes, Bethany Jane | SA | Merit | Research Project B | |
| 442 | Haynes, Mia | SA | Merit | Psychology | |
| 443 | Hayward-Johnson, Mitch | SA | Merit | English | |
| 444 | Hebberman, Ella Jane | SA | Merit | English | |
| 445 | Hegedus, Isaac | SA | Merit | General Mathematics | |
| 446 | Heidari, Ida | SA | Merit | Research Project B | |
| 447 | Heidari, Navah | SA | Merit | General Mathematics | |
| 448 | Henderson, Chloe | Salisbury High School | Salisbury North | Gov of SA Aboriginal Student SACE Award | |