This is the SACE Honour Roll, listing every award, merit or prize won by South Australian SACE students in 2005, along with their school and subject details.
The report also includes significant Australian national awards and prizes such as the Australian Student Prize.
| 744 | O'Brien, Bethany | SA | Merit | Modern History | |
| 745 | O'Brien, Bethany | SA | Merit | Studies of Societies | |
| 746 | O'Donnell, Jarryd Scott | SA | Merit | Geography Studies | |
| 747 | O'Loughlin, Nicholas Charles | SA | Merit | Mathematical Studies | |
| 748 | O'Malley, Elyse-Ann | SA | Merit | Mathematical Studies | |
| 749 | O'Malley, Elyse-Ann | SA | Merit | Physics | |
| 750 | O'Malley, Elyse-Ann | SA | Merit | Specialist Mathematics | |
| 751 | O'Malley, Elyse-Ann Caitlin | Loreto College | Marryatville | Australian Student Prize | |
| 752 | O'Riley, Charee | SA | Merit | Australian History | |
| 753 | Oates, Gregory | SA | Merit | Chemistry | |
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| 754 | Oates, Gregory | SA | Merit | Mathematical Studies | |
| 755 | Oates, Gregory | SA | Merit | Physics | |
| 756 | Oates, Gregory Peter | Xavier College Gawler Belt Campus | Gawler Belt | Australian Student Prize | |
| 757 | Obaydin, Ivan | SA | Merit | Systems and Control Products B | |
| 758 | Ogi, Harumi | SA | Merit | Japanese (Continuers) | |
| 759 | Ogilvie, Alexandra Jane | SA | Merit | English Communications | |
| 760 | Ohlendorf, Sean Graham Campbell | SA | Merit | German (Continuers) | |
| 761 | Ohlendorf, Sean Graham Campbell | SA | Prize: Goethe Prize | German | |
| 762 | Oliver, Todd James | SA | Merit | English Communications | |
| 763 | Ong, Mei Jin | SA | Merit | English as Second Language Studies | |
| 764 | Osborne, Prema Jean | SA | Merit | Music Individual Study | |
| 765 | Ouslinis, Zachary John | SA | Merit | Communication Products A | |
| 766 | Padhye, Vaishali | SA | Merit | Biology | |
| 767 | Padhye, Vaishali | SA | Merit | English Studies | |
| 768 | Padmanabhan, Reena | SA | Merit | English Studies | |
| 769 | Padmanabhan, Reena | SA | Merit | Modern History | |
| 770 | Paley, Madeleine Kate | SA | Merit | Contemporary Issues and Science | |
| 771 | Palm, Carly Erin | SA | Merit | Business Documents | |
| 772 | Panagis, Fiona | SA | Merit | Italian (Continuers) | |
| 773 | Papps, Despina | SA | Merit | Mathematical Studies | |
| 774 | Parasiers, Jasmin Sonya | SA | Merit | Classical Studies | |
| 775 | Parasiers, Jasmin Sonya | SA | Merit | Mathematical Applications | |
| 776 | Parasiers, Jasmin Sonya | SA | Prize: Classical Association of SA Prize | Classical Studies | |
| 777 | Parkin, Julia Lenore Bamford | SA | Merit | English Studies | |
| 778 | Parsons, Alysha Erin | SA | Merit | Physical Education | |
| 779 | Partington, Andrew | SA | Merit | Solo Performance | |
| 780 | Parton, William | SA | Merit | Performance Special Study | |
| 781 | Parton, William | SA | Merit | Solo Performance | |
| 782 | Pascal-Murray, Jennifer Leanne | SA | Merit | Mathematical Applications | |
| 783 | Paschke, Sophia Patrice | SA | Merit | Biology | |
| 784 | Paschke, Sophia Patrice | SA | Merit | Economics | |
| 785 | Paschke, Sophia Patrice | SA | Merit | Legal Studies | |
| 786 | Paschke, Sophia Patrice | SA | Prize: Economics Teachers Society of SA Prize | Economics | |
| 787 | Paschke, Sophia Patrice | Sacred Heart College | Somerton Park | Australian Student Prize | |
| 788 | Paterson, Jenna Anne | SA | Merit | Mathematical Studies | |
| 789 | Paterson, Jenna Anne | SA | Merit | Specialist Mathematics | |
| 790 | Paton, Charlotte Edwina Cadzow | SA | Merit | Classical Studies | |
| 791 | Pearce, Amanda | SA | Merit | Psychology | |
| 792 | Pearce, Sarah | SA | Merit | Mathematical Studies | |
| 793 | Pederick, Lenard | SA | Merit | Mathematical Studies | |