The victory was Netherlands' fourth in as many matches and left it as the only unbeaten team and atop the six-team table with 12 points.
The reigning World Cup champs dominated throughout, creating five penalty corners and holding the Australians without any.
In an earlier match, Nadia Ernestine-Krieke deflected in a shot just before halftime and Julia Mueller converted a penalty corner in the 50th to pace defending champion Germany to a 2-1 victory over Spain. Argentina played Japan in a late match.
Ernestine-Krieke forced Spanish goalkeeper Maria Rosa into two saves before the Germans built their 2-0 lead. Spain had its best early chance in the 24th minute when Monserrat Cruz broke into the circle, but Marta Prat failed to connect on her pass in front of an open goal.
A storm with blustery winds and driving rain plagued the final 20 minutes and hampered Spain's chances. However, Cruz set up Barbara Malda with three minutes remaining, setting up a dramatic finish.