This paper provides data for, or information about, nine environmental indicators related to the condition of Indigenous languages in Australia, being a contribution towards the 2001 national State of the Environment Report. The indicators address the following key issues about the state of Indigenous languages in Australia: * condition of Indigenous languages, * state of documentation of languages, * the wider use of Indigenous languages, * funding, research and education.The study found that in 1996: * there has been a decrease in the percentage of Indigenous people speaking Indigenous languages from 100% in 1800 to 13% in 1996, * there are about 55,000 speakers of Indigenous languages in Australia, * the number of Indigenous languages, and the percentage of people speaking these languages have continued to fall in the period 1986-1996, accelerating over the ten years, and * of the 20 languages categorised in 1990 as 'strong', 3 should now be regarded as 'endangered'.The paper comments on the usefulness of the indicators and makes recommendations to improve either the indicators or the source data collections.