The Australasian Intervarsity Debating Championships (known colloquially as "Australs") is an annual debating tournament for teams from universities in the Australasian region. It is one of the world's largest debating tournaments, second only in size to the World Universities Debating Championship (WUDC), the European Universities Debating Championships (EUDC) and one of the largest annual student events in the world. Australs follows the Australia-Asian Debating format (three speakers plus replies), rather than the British Parliamentary Style used at WUDC. It is held every year in early-July under the auspices of the Australasian Intervarsity Debating Association (AIDA). The host university is selected a year before at a meeting of the Council of the Australasian Intervarsity Debating Association.
The best speaker of the tournament is awarded the "Martin Sorensen Trophy", and the best speaker of the Grand Final is awarded the "Jock Fanselow Cup".
The 2017 Australasian Champions were the Australian National University at the 2017 Australasian Intervarsity Debating Championships hosted by the University of Queensland Debating Society at the University of Queensland in Brisbane, Queensland.
Since the inaugural tournament at the University of Sydney in 1975, Australs has continually expanded the scope of its participants, now attracting around 300 competitors each year from around the Asia-Pacific region. Australs was significantly modernised in 1993 when a new constitution was introduced by then AIDA President. The Constitution provided for standard rules of debate and adjudication, and provided for extended voting rights for non-Australian and New Zealand participants. Currently teams come from Australia, Bangladesh, China, Hong Kong, India, Indonesia, Japan, Malaysia, New Zealand, Singapore, South Korea, Thailand and the Philippines.
Prior to the inception of the AIDA in 1990, there were occasional problems with the administration and rule-format for Australs, as the running of the tournament was left to the host university, with a meeting of all Universities at the end of the competition. There was little ongoing supervision of the hosts, and adjudication standards varied widely.