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.
| 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 | |
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| 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 | |
| 649 | Lightbody, Caitriona Kirby (Cait) | SA | Merit | Physics | |
| 650 | Lightbody, Caitriona Kirby (Cait) | SA | Merit | Research Project B | |
| 651 | Lim, En Qi | SA | Merit | Religion Studies | |
| 652 | Lim, Jaimin | SA | Merit | Specialist Mathematics | |
| 653 | Lim, Zhi En | SA | Merit | Music Performance - Solo | |
| 654 | Lindblom, Zane | Westminster School | Marion | Gov of SA SACE Award | |
| 655 | Lindner, Emily | SA | Merit | English | |
| 656 | Lindner, Emily | Seymour College | Glen Osmond | Gov of SA SACE Award | |
| 657 | Ling, Lisa | SA | Merit | Visual Arts - Design | |
| 658 | Little, Chloe | SA | Merit | English | |
| 659 | Littleton, Amelia | SA | Merit | Society and Culture | |
| 660 | Liu, Daniel Jia Pei | SA | Merit | Mathematical Methods | |
| 661 | Liu, Rucan (James) | SA | Merit | Mathematical Methods | |
| 662 | Liu, Ryan Yan | SA | Merit | Chemistry | |
| 663 | Liu, Ryan Yan | SA | Merit | Physics | |
| 664 | Livingston-Pearce, Sophie Grace | SA | Merit | Drama | |
| 665 | Lockie, Sophia Anjeli | SA | Merit | Research Project B | |
| 666 | Lok, Gwyneth | SA | Merit | Child Studies | |
| 667 | Lombard, Jeanne Mignonne | SA | Merit | Music Performance - Solo | |
| 668 | Long, Madelyn | SA | Merit | Creative Arts | |
| 669 | Lord, Alastair | SA | Merit | English | |
| 670 | Lorraine, Sophie | SA | Merit | Research Project B | |
| 671 | Lowe, Troy Nathan | SA | Merit | Essential English | |
| 672 | Lowman, Archer | SA | Merit | Modern History | |
| 673 | Luke, Sophie | SA | Merit | Business Innovation | |
| 674 | Lunau, Noah Mitchell | SA | Merit | Chemistry | |
| 675 | Lunau, Noah Mitchell | SA | Merit | Physics | |
| 676 | Lunau, Noah Mitchell | SA | Merit | Research Project B | |
| 677 | Lupoi, Sonia | SA | Merit | Research Project B | |
| 678 | Luraschi, Elah-Daisy Grace | SA | Merit | English | |
| 679 | Luraschi, Elah-Daisy Grace | SA | Merit | Visual Arts - Art | |
| 680 | Luscombe, Clancy | SA | Merit | Workplace Practices | |
| 681 | Lust, Clarisse Elise | SA | Merit | General Mathematics | |
| 682 | Lust, Clarisse Elise | SA | Merit | Psychology | |