This report shows the total number of HSC Distinguished Achiever awards won by students in each subject at each school during 2021.
| 1 | Blacktown Girls High School | Blacktown | Biology | 7 |
| 2 | Blacktown Girls High School | Blacktown | Mathematics Advanced | 7 |
| 3 | Blacktown Girls High School | Blacktown | Information Processes and Technology | 6 |
| 4 | Blacktown Girls High School | Blacktown | Personal Development, Health and Physical Education | 6 |
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| 5 | Blacktown Girls High School | Blacktown | Investigating Science | 5 |
| 6 | Blacktown Girls High School | Blacktown | Mathematics Standard 2 | 5 |
| 7 | Blacktown Girls High School | Blacktown | English Extension 1 | 4 |
| 8 | Blacktown Girls High School | Blacktown | Mathematics Extension 1 | 4 |
| 9 | Blacktown Girls High School | Blacktown | Visual Arts | 4 |
| 10 | Blacktown Girls High School | Blacktown | Ancient History | 3 |
| 11 | Blacktown Girls High School | Blacktown | Community and Family Studies | 3 |
| 12 | Blacktown Girls High School | Blacktown | Chemistry | 2 |
| 13 | Blacktown Girls High School | Blacktown | English Advanced | 2 |
| 14 | Blacktown Girls High School | Blacktown | French Beginners | 2 |
| 15 | Blacktown Girls High School | Blacktown | History Extension | 2 |
| 16 | Blacktown Girls High School | Blacktown | Society and Culture | 2 |
| 17 | Blacktown Girls High School | Blacktown | Business Services Examination | 1 |
| 18 | Blacktown Girls High School | Blacktown | Business Studies | 1 |
| 19 | Blacktown Girls High School | Blacktown | Economics | 1 |
| 20 | Blacktown Girls High School | Blacktown | Filipino Continuers | 1 |
| 21 | Blacktown Girls High School | Blacktown | Modern History | 1 |