The first instalment in the Potter series finale pulled in $6.7 million to easily best new releases Due Date and Fair Game, which open at numbers two and three respectively.
Last week's chart runner-up Jackass 3D falls to number four, while The Social Network lands in fifth place.
The only other new entry, the Eli Roth-produced Last Exorcism, lands at number six.
The box office top ten in full (figures in Australian dollars):
1. (1) Harry Potter And The Deathly Hallows: Part 1 - $6,729,918
2. (-) Due Date - $2,670,421
3. (-) Fair Game - $587,118
4. (2) Jackass 3D - $533,027
5. (3) The Social Network - $488,862
6. (-) The Last Exorcism - $463,193
7. (4) RED - $364,603
8. (5) Skyline - $166,168
9. (6) Life As We Know It - $149,165
10. (7) Wild Target - $120,167
