57th World Science Fiction Convention
| Aussiecon Three, the 57th World Science Fiction Convention | |
|---|---|
| Genre | Science fiction | 
| Dates | 2–6 September 1999 | 
| Venue | Melbourne Convention and Exhibition Centre | 
| Location(s) | Melbourne | 
| Country | Australia | 
| Filing status | Non-profit | 
| Website | aussiecon3.worldcon.org | 
The 57th World Science Fiction Convention (Worldcon), also known as Aussiecon Three, was held on 2–6 September 1999 at the Melbourne Convention and Exhibition Centre in Melbourne, Australia.
The convention was chaired by Perry Middlemiss.