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linux.conf.au (often abbreviated as lca or LCA) is Australasia's regional Linux and Open Source conference. It is a roaming conference, held in a different Australian or New Zealand city every year, coordinated by Linux Australia and organised by local volunteers.
The conference is a non-profit event, with any surplus funds being used to seed the following year's conference and to support the Australian Linux and open source communities. The name is the conference's URL, using the uncommon second-level domain .conf.au.
Although several online events were ran post-COVID, since 2023 Linux Australia has instead auspiced Everything Open. This is a shorter three-day conference that follows a similar format - but without the additional two days of Miniconfs.