| Siding Spring-LCO Clamshell #1 | Coonabarabran | — |
| Siding Spring-LCO Clamshell #2 | Coonabarabran | — |
| SKA Telescope, Australia | Western Australia | — |
 SkyMapper | New South Wales | 1.163 m |
| Stockport observatory | Stockport County Football Club | — |
| Swan Hill observatory | Swan Hill | — |
| Tamworth Observatory | Tamworth | — |
| Tangra observatory | St. Clair | — |
| Taylor Range Observatory | Brisbane | — |
 The Heights Observatory | South Australia | — |
| Thornlands observatory | Thornlands | — |
| Tzec Maun observatory | Moorook | — |
| Tzec Maun observatory (before 2010) | Pingelly | — |
| University of Southern Queensland observatory | Greenmount | — |
| UWA observatory | Crawley Town Football Club | — |
 UWS Rotary Observatory | New South Wales | — |
| Wallaroo observatory | Macropus robustus | — |
| Wanniassa observatory | Wanniassa | — |
| Warrumbungle Observatory | Coonabarabran | — |
| Windsor observatory | — | — |
| Wobblesock observatory | Coonabarabran | — |
| Woogaroo Observatory | Forest Lake | — |
| YSVP observatory | Vale Park | — |
| Zadko Observatory | Western Australia | 50 m |