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.
| 771 | Morelli, Charlotte | SA | Merit | Food and Hospitality | |
| 772 | Morrissy, Ellie | SA | Merit | Religion Studies | |
| 773 | Mortimer, James Keating | SA | Merit | Media Studies | |
| 774 | Moss, Madeleine | Walford Anglican School for Girls | Hyde Park | Gov of SA SACE Award | |
| 775 | Moss, Madeleine Jemima | SA | Merit | English Literary Studies | |
| 776 | Moss, Madeleine Jemima | SA | Merit | Mathematical Methods | |
| 777 | Moss, Madeleine Jemima | SA | Merit | Physics | |
| 778 | Moukachar, Giselle | SA | Merit | Research Project B | |
| 779 | Muir, Georgia Mary | SA | Merit | Physical Education | |
| 780 | Muir, Sarah Louise | SA | Merit | Physical Education | |
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| 781 | Mukherjee, Devika Kim | SA | Merit | Philosophy | |
| 782 | Mulvany, Olivia Elizabeth | SA | Merit | Outdoor Education | |
| 783 | Munir, Liam Zain | SA | Merit | Physics | |
| 784 | Munro, Rebekah Grace | SA | Merit | Modern History | |
| 785 | Muralikumar, Sankalp | SA | Merit | Mathematical Methods | |
| 786 | Muralikumar, Sankalp | SA | Merit | Physics | |
| 787 | Murphy, Ryan Benjamin | SA | Merit | Psychology | |
| 788 | Murphy, Ryan Benjamin | SA | Merit | Research Project B | |
| 789 | Murray, Isabell Grace | Henley High School | Henley Beach | Prize: Hardwicke College Prize | Biology |
| 790 | Murray, Isabella Grace | SA | Merit | Biology | |
| 791 | Murray, Isabella Grace | SA | Merit | Chemistry | |
| 792 | Murugan, Dhaanya | SA | Merit | Child Studies | |
| 793 | Musolino, Natalie | SA | Merit | Information Processing and Publishing | |
| 794 | Mutze, Sacha Rose | SA | Merit | General Mathematics | |
| 795 | Nagel, Alanis | SA | Merit | Religion Studies | |
| 796 | Nagel, Alanis | SA | Merit | Research Project B | |
| 797 | Nagpal, Jeevika | SA | Merit | General Mathematics | |
| 798 | Nagpal, Jeevika | SA | Merit | Integrated Learning B | |
| 799 | Nair, Alisha Shaina | SA | Merit | Research Project B | |
| 800 | Nairn, Yasmin Sophie | SA | Merit | Research Project B | |
| 801 | Nathan, Max Bernard | SA | Merit | Chemistry | |
| 802 | Nedomansky, Daniel | SA | Merit | Mathematical Methods | |
| 803 | Nehvi, Parizaad Tariq | SA | Merit | Ancient Studies | |
| 804 | Nehvi, Parizaad Tariq | SA | Merit | English Literary Studies | |
| 805 | Nehvi, Parizaad Tariq | SA | Merit | Research Project B | |
| 806 | Nelson, Lisa Mary | SA | Merit | General Mathematics | |
| 807 | Nenke, Charlotte | SA | Merit | Research Project B | |
| 808 | Newberry, Edward | SA | Merit | Research Project B | |
| 809 | Ngo, Sophie | SA | Merit | English | |
| 810 | Nguyen, Alyssa | SA | Merit | Research Project B | |
| 811 | Nguyen, Bao Nhat | SA | Merit | Integrated Learning A | |
| 812 | Nguyen, Huy Lam | SA | Merit | Specialist Mathematics | |
| 813 | Nguyen, Lisa | SA | Merit | English as an Additional Language | |
| 814 | Nguyen, Ngoc Minh Van | SA | Merit | Business Innovation | |
| 815 | Nguyen, Ngoc Minh Van | SA | Merit | Information Processing and Publishing | |
| 816 | Nguyen, Sophie | SA | Merit | English as an Additional Language | |
| 817 | Nguyen, Tiffanii Bao-Ngoc | SA | Merit | Research Project B | |
| 818 | Nguyen, Trung-Hieu | SA | Merit | Essential English | |
| 819 | Nguyen, Trung-Hieu | SA | Merit | Health and Wellbeing | |
| 820 | Nguyen, Vanessa | SA | Merit | Research Project B | |