This is the SACE Honour Roll, listing every award, merit or prize won by South Australian SACE students in 2003, along with their school and subject details.
The report also includes significant Australian national awards and prizes such as the Australian Student Prize.
| 665 | Lai, Yin Yee | SA | Merit | Chemistry | |
| 666 | Lai, Yin Yee | SA | Merit | English Studies | |
| 667 | Lam, Hien Duy | SA | Merit | English as Second Language Studies | |
| 668 | Lambos, Elaine | SA | Merit | Art Practical | |
| 669 | Large, Sianne Cara | SA | Merit | Mathematical Applications | |
| 670 | Lathouros, Marie | SA | Merit | Child Studies | |
| 671 | Lau, Silvia | SA | Merit | English as Second Language Studies | |
| 672 | Lau, Silvia | SA | Merit | Tourism | |
| 673 | Lawless, Tanya Maree | SA | Merit | Music in Society | |
| 674 | Lay, Frieda | SA | Merit | English as Second Language Studies | |
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| 675 | Le Poidevin, Aaron Jon | SA | Merit | Economics | |
| 676 | Le Poidevin, Aaron Jon | SA | Merit | Information Technology Studies | |
| 677 | Le Poidevin, Aaron Jon | SA | Merit | Legal Studies | |
| 678 | Lebbon, Michael | SA | Merit | Business Studies | |
| 679 | Lebbon, Michael | SA | Merit | Economics | |
| 680 | Lebbon, Michael | SA | Merit | Mathematical Studies | |
| 681 | Lebbon, Michael | SA | Merit | Physics | |
| 682 | Lebbon, Michael | SA | Merit | Specialist Mathematics | |
| 683 | Lebbon, Michael James | St Peters College | St Peters | Australian Student Prize | |
| 684 | Lee, Chooi-Ann | SA | Merit | Solo Performance | |
| 685 | Lee, Jonathan Aik Keong | SA | Merit | Mathematical Studies | |
| 686 | Lee, Silvan Michelle | SA | Merit | Geography Studies | |
| 687 | Leedham, Bryce Robert | SA | Merit | Mathematical Studies | |
| 688 | Leedham, Bryce Robert | SA | Merit | Physics | |
| 689 | LeMESSURIER, Richard | SA | Merit | Technical Graphics | |
| 690 | Lemon, Phillip Edward | SA | Merit | Mathematical Studies | |
| 691 | Lemon, Phillip Edward | SA | Merit | Specialist Mathematics | |
| 692 | Levy, Gabriel | SA | Merit | Music Individual Study | |
| 693 | Lewis, Zoe Aasta | SA | Merit | Geography Studies | |
| 694 | Li, Duo | SA | Merit | Mathematical Studies | |
| 695 | Li, Duo | SA | Merit | Specialist Mathematics | |
| 696 | Li, Lin Lin | SA | Merit | Mathematical Studies | |
| 697 | Li, Xin | SA | Merit | Mathematical Methods | |
| 698 | Liddicoat, Joel Dennis | SA | Merit | Music Individual Study | |
| 699 | Liensavanh, Anouvong | SA | Merit | Solo Performance | |
| 700 | Liew, Ellise Danielle | SA | Merit | English Communications | |
| 701 | Liew, Ellise Danielle | SA | Merit | Geography Studies | |
| 702 | Lim, Michelle | SA | Merit | Chemistry | |
| 703 | Lim, Michelle | SA | Merit | English Studies | |
| 704 | Lim, Michelle | SA | Merit | Mathematical Studies | |
| 705 | Lim, Michelle | SA | Merit | Physics | |
| 706 | Lim, Michelle | SA | Merit | Specialist Mathematics | |
| 707 | Lim, Michelle | Wilderness School | Medindie | Australian Student Prize | |
| 708 | Lines, Kimberley | SA | Merit | Health, Recreation and the Community | |
| 709 | Liu, Jenny | SA | Merit | Mathematical Studies | |
| 710 | Liu, Jenny | SA | Merit | Physics | |
| 711 | Lloyd, Melissa Elena | SA | Merit | Physical Education | |
| 712 | Lo, Gary Ka-Shun | SA | Merit | Chinese (Continuers) | |
| 713 | Lobo, Yolanka | SA | Merit | Biology | |
| 714 | Lobo, Yolanka | SA | Merit | Italian (Continuers) | |