The Australasian Society for Trenchless Technology (ASTT) is the peak body for trenchless technology in Australasia, providing advocacy, leadership, support and educational opportunities for organisations and individuals involved in trenchless technology.

The ASTT was formed in 1991 as the Australian Society, expanding in 1994 to serve also New Zealand. Corporate and Individual membership levels are available.

For over 30 years, the ASTT has provided members with access to the latest technological advancements, technical information, and educational opportunities through Trenchless Australasia Magazine, the No Dig Down Under conference, as well as providing access to industry tools, technical forums and webinars.

The ASTT also includes a number of Special Interest Groups. These technical divisions represent a specific trenchless sector. The ASTT encourages members to consider joining a Special Interest Group.

The objectives of ASTT are to:

• Advance the science and practice of trenchless technology for the public benefit
• Provide a forum in Australia and New Zealand for interchange of multi disciplinary knowledge and skills in the field of trenchless technology
• Arrange or sponsor meetings, conferences and symposia on subjects consistent with the objectives of the Society
• Encourage the interchange of specialists in trenchless technology within Australia and New Zealand
• Liaise and establish affiliations with related organisations, both within Australia, New Zealand and overseas
• Inform and advise the public and Government on matters concerned with trenchless technology
• Encourage education, training and research

Successful National Conferences & Exhibitions (No Dig Down Under) are held every two years typically and have been held in Melbourne, Sydney, Perth and Brisbane.

The ASTT has hosted three (3) ISTT International NO-DIG's in Perth (2000),  Brisbane ( 2006) and Sydney (2013). It is scheduled to host the 2026 ISTT International NO-DIG in Auckland, New Zealand, in September 2026.