This is the SACE Honour Roll, listing every award, merit or prize won by South Australian SACE students in 2018, along with their school and subject details.
The report also includes significant Australian national awards and prizes such as the Australian Student Prize.
| 925 | SHALLOW, Lauren June | SA | Merit | Research Project B | |
| 926 | SHEPHERD, Kirstyn Elise | SA | Merit | Psychology | |
| 927 | SIAW, Elizabeth | SA | Merit | Chemistry | |
| 928 | SIAW, Elizabeth | SA | Merit | English | |
| 929 | SIAW, Elizabeth | SA | Merit | Mathematical Methods | |
| 930 | SIMKIN, Isabelle Chloe | SA | Merit | Spanish (Continuers) | |
| 931 | SIMONS, Tenelle Lee | SA | Merit | Material Products I | |
| 932 | SINGH, Prashansa | SA | Merit | Physics | |
| 933 | SINGH, Prashansa | SA | Merit | Specialist Mathematics | |
| 934 | SITRIN, Shiran | SA | Merit | General Mathematics | |
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| 935 | SIVADASAN, Anushka | SA | Merit | Psychology | |
| 936 | SLADE, Alannah | SA | Merit | Workplace Practices | |
| 937 | SLADOJEVIC, Daniel Dusan | SA | Merit | General Mathematics | |
| 938 | SMITH, Ana | SA | Merit | Research Project B | |
| 939 | SMITH, Eden | SA | Merit | Research Project B | |
| 940 | SMITH, Hayden | SA | Merit | Material Products I | |
| 941 | SMITH, Jacqueline Georgia | SA | Merit | General Mathematics | |
| 942 | SMITH, Philippa Jacqueline Macpherson | SA | Merit | Research Project B | |
| 943 | SMITH, Samuel James | SA | Merit | Information Technology | |
| 944 | SMITH, Stuart Eric | SA | Merit | Physics | |
| 945 | SMYTH, Abby Yvette | SA | Merit | Visual Arts - Art | |
| 946 | SNOW, Nicholas William Patrick | SA | Merit | Research Project B | |
| 947 | Solomon, Adele | Adelaide East Education Centre | Paradise | Gov of SA Excellence in Modified SACE Award | |
| 948 | SOLOMON, Isaac Daryll | SA | Merit | Research Project B | |
| 949 | SPEIS, Sonja | SA | Merit | Religion Studies | |
| 950 | SPEIS, Sonja | SA | Merit | Research Project B | |
| 951 | SPYKER, Kalea Adele | SA | Merit | Health | |
| 952 | SQUIRE, Bridie | SA | Merit | Biology | |
| 953 | SQUIRE, Bridie | SA | Merit | English | |
| 954 | Squire, Bridie | St Aloysius College | Adelaide | Gov of SA SACE Award | |
| 955 | SREDOJEVIC, Alex | SA | Merit | Research Project B | |
| 956 | SRITHAR, Niranjan | SA | Merit | Integrated Learning A | |
| 957 | STALLAN, Caitlin Marie | SA | Merit | Workplace Practices | |
| 958 | STANBURY, Mia Jane | SA | Merit | English | |
| 959 | STARBUCK, James Robert | SA | Merit | English | |
| 960 | STEFANIDIS, Eugenia Jennifer | SA | Merit | English Literary Studies | |
| 961 | STEINMANN, Daniela | SA | Merit | Psychology | |
| 962 | STENCHLIK, Sebastian | SA | Merit | Integrated Learning A | |
| 963 | STEPHENS, Madison | SA | Merit | Modern History | |
| 964 | STEPHENSON, Adelia Jordyn | SA | Merit | Research Project B | |
| 965 | STEPHENSON, Alexandra Claire | SA | Merit | Research Project B | |
| 966 | STEWART, Harrison | SA | Merit | Research Project B | |
| 967 | STRUNK, Harrison James | SA | Merit | English | |
| 968 | STRUNK, Harrison James | SA | Merit | General Mathematics | |
| 969 | STUART, Benjamin Thomas | SA | Merit | Material Products II | |
| 970 | SUBRAMANIAM, Samuel George Thuraisingam | SA | Merit | Research Project B | |
| 971 | SUKHEJA, Mansa | SA | Merit | Biology | |
| 972 | SUKHEJA, Mansa | SA | Merit | Chemistry | |
| 973 | SUKHEJA, Mansa | SA | Merit | Psychology | |
| 974 | SUKHIJA, Rajat | SA | Merit | Chemistry | |