Yes, the United States includes Australia in the Visa Waiver Program. Under the Visa Waiver Program, Australians staying in the US for less than 90 days for tourism or business purposes won't need to apply for a visa before entering the United States, provided they have a valid ESTA authorisation.

Any advice is general advice only and does not take into account your individual objectives, financial situation, or needs. As entry and visa requirements for the US may change over time, it is your responsibility to verify entry and visa requirements with the official government authorities including the US Department of State - Bureau of Consular Affairs, the United States Customs and Border Protection (CBP), the US Embassy in Australia or your local US Consulate.