The Australian Signals Directorate (ASD), formerly the Defence Signals Directorate, is a statutory agency of the Government of Australia responsible for signals intelligence, providing intelligence support to Australian military operations, conducting cyberwarfare and ensuring information security. The ASD is a part of the larger Australian Intelligence Community, and its role within the so-called Five Eyes intelligence-sharing alliance is to monitor signals intelligence in South and East Asia. The Australian Cyber Security Centre (ACSC) is an agency within the ASD.
The unit was established in 1947 by executive order as the Defence Signals Bureau within the Department of Defence, and underwent several name changes until its current name ASD was adopted in 2013. ASD was converted to a statutory body by the Intelligence Services Act 2001. ASD is based in Canberra, at the Defence Department Headquarters at Russell Offices. As of February 2020, Rachel Noble is the Director-General of ASD, replacing Mike Burgess, who was appointed Director-General of Security in September 2019.