| 19992 | Zou, Yannuo | Koonung Secondary College | Mont Albert North | General Mathematics | 40 |
| 19993 | Zou, Zichuan | Camberwell Grammar School | Canterbury | Mathematical Methods | 44 |
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| 19994 | Zouros, Rose | Lowther Hall Anglican Grammar School | Essendon | Health and Human Development | 46 |
| 19995 | Zouros, Rose | Lowther Hall Anglican Grammar School | Essendon | English | 40 |
| 19996 | Zubic, Ivana | Lalor Secondary College | Lalor | Psychology | 40 |
| 19997 | Zukerman, Dion | Bialik College | Hawthorn | Physics | 45 |
| 19998 | Zukerman, Dion | Bialik College | Hawthorn | Mathematical Methods | 42 |
| 19999 | Zulkarnain, Zara Binti | John Monash Science School | Clayton | Mathematical Methods | 43 |
| 20000 | Zulkarnain, Zara Binti | John Monash Science School | Clayton | Environmental Science | 40 |
| 20001 | Zumpe, Saffron Lily | Kardinia International College | Bell Post Hill | English | 42 |
| 20002 | Zuvela, Chloe Alice | Mount St Joseph Girls College | Altona | Legal Studies | 48 |
| 20003 | Zuvela, Chloe Alice | Mount St Joseph Girls College | Altona | Health and Human Development | 45 |
| 20004 | Zwag, Lydia Jireh | Waverley Christian College Wantirna South | Wantirna South | Media | 45 |
| 20005 | Zylberman, Amelia Mikhailova | Haileybury Girls College | Keysborough | English | 47 |