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.
| 1043 | Sierp, Ruby Odem Olivia | SA | Merit | Research Project B | |
| 1044 | Siggurs, Elliot Grace | SA | Merit | Research Project B | |
| 1045 | Sihota, Shaana Kaur | SA | Merit | Psychology | |
| 1046 | Simmonds, Emily Rose | SA | Merit | General Mathematics | |
| 1047 | Simmonds, Emily Rose | SA | Merit | Psychology | |
| 1048 | Simmonds, Kate Amelia | SA | Merit | Business Innovation | |
| 1049 | Simmonds, Kate Amelia | SA | Merit | General Mathematics | |
| 1050 | Simmonds, Kate Amelia | SA | Merit | Psychology | |
| 1051 | Sin, Dongmin | SA | Merit | English as an Additional Language | |
| 1052 | Singh, Gurjot | SA | Merit | Accounting | |
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| 1053 | Skubala, Sebastien | SA | Merit | Business Innovation | |
| 1054 | Slade, Mia Ashlea | SA | Merit | Food and Hospitality | |
| 1055 | Sleath, Bronte | SA | Merit | Geography | |
| 1056 | Slobodian, Alex | SA | Merit | Integrated Learning A | |
| 1057 | Smailes, Hannah | SA | Merit | Research Project B | |
| 1058 | Smith, Ethan Wayne Stephen | SA | Merit | Business Innovation | |
| 1059 | Smith, Jamie Ross | SA | Merit | Workplace Practices | |
| 1060 | Smith, Nicholas William James | SA | Merit | Mathematical Methods | |
| 1061 | Smith, Sophie | SA | Merit | Religion Studies | |
| 1062 | Smith, William Lindsay Macpherson | SA | Merit | Research Project B | |
| 1063 | Smolicz, Alexandra Olenka | SA | Merit | English | |
| 1064 | Snadden, Cody | SA | Merit | Material Solutions | |
| 1065 | Snel, Femke Alexandra | SA | Merit | English | |
| 1066 | Snodgrass, Darcy Tom | SA | Merit | Material Solutions | |
| 1067 | So, Nok Ching | SA | Merit | English as an Additional Language | |
| 1068 | Soden, Leith | SA | Merit | Mathematical Methods | |
| 1069 | Soe, Khin Thidagu Kyaw (Caroline) | SA | Merit | General Mathematics | |
| 1070 | Solding, Mereki | SA | Merit | Industry and Entrepreneurial Solutions | |
| 1071 | Somido, Arabella | SA | Merit | English | |
| 1072 | Sood, Ishani | SA | Merit | English | |
| 1073 | Sood, Ishani | SA | Merit | Legal Studies | |
| 1074 | Soontiens, Wian | SA | Merit | English | |
| 1075 | Soontiens, Wian | SA | Merit | Psychology | |
| 1076 | Soontiens, Wian | SA | Merit | Research Project B | |
| 1077 | South, Ella | SA | Merit | Information Processing and Publishing | |
| 1078 | South, Ella | SA | Merit | Research Project A | |
| 1079 | Soutter, Miette Carmelina | SA | Merit | Business Innovation | |
| 1080 | Spajic, Anna | SA | Merit | Health and Wellbeing | |
| 1081 | Spartalis, Lily-Rose | SA | Merit | Physical Education | |
| 1082 | Spillane, Paris Bailey | SA | Merit | Health and Wellbeing | |
| 1083 | Spinelli, Eloisa | SA | Merit | English | |
| 1084 | Sprudzans, Elza Sofija | SA | Merit | Visual Arts - Art | |
| 1085 | Spyker, Lily | SA | Merit | Biology | |
| 1086 | Spyrou, Thomas | SA | Merit | Modern Greek (Continuers) | |
| 1087 | Spyrou, Thomas | SA | Merit | Research Project B | |
| 1088 | Srivastava, Tanvi | SA | Merit | Research Project B | |
| 1089 | Stafford, Nathan | SA | Merit | Creative Arts | |
| 1090 | Stafford, Nathan | SA | Merit | Research Project B | |
| 1091 | Stallard, Taylah | SA | Merit | Research Project B | |
| 1092 | Stamatelopoulo, Zoi | SA | Merit | Religion Studies | |