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.
| 718 | Marshall, Tara Jane | SA | Merit | English | |
| 719 | Marston, Tayla | SA | Merit | Food and Hospitality | |
| 720 | Martin, Jyothika Theresa | SA | Merit | English as an Additional Language | |
| 721 | Martin, Madison Ann | SA | Merit | Child Studies | |
| 722 | Mason-Tapping, Alice | SA | Merit | English Literary Studies | |
| 723 | Masullo, Alessio | SA | Merit | Integrated Learning A | |
| 724 | Mathews, Ross | SA | Merit | English | |
| 725 | Mathie, Bridey Jaslyn | SA | Merit | Food and Hospitality | |
| 726 | Matkovic, Liam Antony | SA | Merit | Essential Mathematics | |
| 727 | Matteo, Zara | SA | Merit | English | |
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| 728 | Matz, Owen William | SA | Merit | Research Project B | |
| 729 | Mauviel, Olivia | SA | Merit | Research Project B | |
| 730 | Mavraidi, Eleni | SA | Merit | Research Project B | |
| 731 | Maxted, Brianna Lee | SA | Merit | Chemistry | |
| 732 | Maxted, Brianna Lee | SA | Merit | Physics | |
| 733 | McClements, Iona Mae | SA | Merit | Research Project B | |
| 734 | McDonald, Cooper Jackson | SA | Merit | Accounting | |
| 735 | McDonald, Mikaylah | SA | Merit | Biology | |
| 736 | McDonald, Mikaylah | SA | Merit | Research Project B | |
| 737 | McGough, Sofia Jade | SA | Merit | Research Project B | |
| 738 | Mckay, Charles Henry | SA | Merit | Economics | |
| 739 | Mckay, Winter Jade | SA | Merit | Research Project B | |
| 740 | McKenny, Darcy | SA | Merit | Research Project B | |
| 741 | McLeod, Georgia Skye | SA | Merit | Research Project B | |
| 742 | McLoughlin, Anthony | SA | Merit | Integrated Learning A | |
| 743 | McMahon, Aaron John David | SA | Merit | Research Project B | |
| 744 | McPhee, Katrina Louise | SA | Merit | Research Project B | |
| 745 | Meda, Aaditya Dhandapani | SA | Merit | Integrated Learning A | |
| 746 | Menadue, Keeley | SA | Merit | Integrated Learning B | |
| 747 | Menadue, Keeley | SA | Merit | Research Project B | |
| 748 | Menadue, Keeley | Xavier College Gawler Belt Campus | Gawler Belt | Gov of SA SACE Award | |
| 749 | Mennillo, Isabella Audrey | SA | Merit | Biology | |
| 750 | Mennillo, Isabella Audrey | SA | Merit | English | |
| 751 | Mennillo, Isabella Audrey | SA | Merit | Psychology | |
| 752 | Merchant, Eloise | SA | Merit | Workplace Practices B | |
| 753 | Meurant, Eleanor | SA | Merit | English | |
| 754 | Meurant, Eleanor | SA | Merit | Research Project B | |
| 755 | Middleton, Abby | SA | Merit | Research Project B | |
| 756 | Middleton, Zali | SA | Merit | General Mathematics | |
| 757 | Miles, Ethan Cooper | SA | Merit | English | |
| 758 | Millar, Kaitlyn Chelsea | SA | Merit | English Literary Studies | |
| 759 | Millar, Kaitlyn Chelsea | SA | Merit | General Mathematics | |
| 760 | Miller, Rose | SA | Merit | General Mathematics | |
| 761 | Milton, Jasmine | Concordia College | Highgate | Prize: Don Maynard Music Prize | Music |
| 762 | Min, Alice Soklee | SA | Merit | Research Project B | |
| 763 | Minagall, Paige | SA | Merit | Research Project B | |
| 764 | Mitchell, Kern Lee | SA | Merit | Material Solutions | |
| 765 | Mohamed Azmi, Muhammad Hariz | SA | Merit | Research Project B | |
| 766 | Molony, Liza Rose | SA | Merit | English | |
| 767 | Montes, Annabel Lucy | SA | Merit | General Mathematics | |