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.
| 599 | Kunninti, Praharshitha | SA | Merit | Research Project B | |
| 600 | Kvasniuk, Zachary | SA | Merit | Language and Culture | |
| 601 | Kyros, Kate | SA | Merit | Geography | |
| 602 | La, Ethan An Duy | SA | Merit | Chemistry | |
| 603 | La, Ethan An Duy | SA | Merit | Research Project B | |
| 604 | Lam, Caitlyn | SA | Merit | Chemistry | |
| 605 | Lam, Caitlyn | SA | Merit | English | |
| 606 | Lam, Caitlyn | SA | Merit | Psychology | |
| 607 | Lam, Lai-Yin | SA | Merit | Mathematical Methods | |
| 608 | Lamahewa, Thimitha | SA | Merit | Mathematical Methods | |
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| 609 | Lamb, Bailey | SA | Merit | Research Project A | |
| 610 | Lamb, Jennifer Jean | SA | Merit | Psychology | |
| 611 | Lancaster, Sarah | SA | Merit | Research Project B | |
| 612 | Lane, Victoria Rose | SA | Merit | Physical Education | |
| 613 | Langfield, Bradley James | SA | Merit | Digital Technologies | |
| 614 | Langford, Ruby Grace | SA | Merit | Research Project B | |
| 615 | Larkin, Jack Raymond | SA | Merit | Research Project B | |
| 616 | Laverde, Juliana | SA | Merit | Biology | |
| 617 | Laverde, Juliana | SA | Merit | English Literary Studies | |
| 618 | Lawrence, Isaac Nicholas | SA | Merit | General Mathematics | |
| 619 | Lazarevich, Vasiliki | SA | Merit | Biology | |
| 620 | Lazarevich, Vasiliki | SA | Merit | English Literary Studies | |
| 621 | Lazarevich, Vasiliki | SA | Merit | French (Continuers) | |
| 622 | Le, Alexandra Anne | SA | Merit | Mathematical Methods | |
| 623 | Le, Alexandra Anne | SA | Merit | Music Performance - Solo | |
| 624 | Le, Justin Tam | SA | Merit | Chemistry | |
| 625 | Le, Minh Khoi Peter | SA | Merit | Essential Mathematics | |
| 626 | Le, Thien An | SA | Merit | English | |
| 627 | Lee, Alex Ho-Yee | SA | Merit | Specialist Mathematics | |
| 628 | Lee, Arabella Rose | SA | Merit | Research Project B | |
| 629 | Lee, Isaiah Sheng | SA | Merit | Research Project B | |
| 630 | Lee, Rachel Wei-An | SA | Merit | Mathematical Methods | |
| 631 | Lee, Rachel Wei-An | SA | Merit | Specialist Mathematics | |
| 632 | Lee, Seojun | SA | Merit | Japanese (Continuers) | |
| 633 | Lee, Seung Hyun | SA | Merit | Chemistry | |
| 634 | Lee, Sue Yi | SA | Merit | General Mathematics | |
| 635 | Lehmann, William John | SA | Merit | Research Project B | |
| 636 | Leinonen, Grace Elina | SA | Merit | Chemistry | |
| 637 | Leinonen, Grace Elina | SA | Merit | Physics | |
| 638 | Lekamge, Chirath Gawrawa Bandara | SA | Merit | English | |
| 639 | Lennox, Amber | Pulteney Grammar School | Adelaide | Prize: Tennyson Medal | English Studies |
| 640 | Lennox, Amber Ngoc Tran | SA | Merit | English Literary Studies | |
| 641 | Leombruno, Adam | SA | Merit | Essential English | |
| 642 | Lewis, Tyson Robert | SA | Merit | Creative Arts | |
| 643 | Lewis, Tyson Robert | SA | Merit | Food and Hospitality | |
| 644 | Li, Angel | SA | Merit | Music Performance - Ensemble | |
| 645 | Li, Angel | SA | Merit | Music Performance - Solo | |
| 646 | Li, Lei | SA | Merit | English | |
| 647 | Libra, Jessica | SA | Merit | Research Project B | |
| 648 | Lieberenz, Christopher | SA | Merit | Mathematical Methods | |