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The Opposition  in Australia fulfils the same function as the official opposition in other Commonwealth of Nations monarchies. It is seen as the alternative government and the existing administration's main opponent at a general election. By convention, the Opposition Leader comes from the House of Representatives, as does the deputy, although the Government and Opposition will also both have leaders in the Senate.
The Opposition at the level of the States and Territories are:
- Australian Capital Territory: Liberal Party of Australia, led by Jeremy Hanson.
- New South Wales: Australian Labor Party, led by Luke Foley.
- Northern Territory: Australian Labor Party, led by Michael Gunner.
- Queensland: Liberal National Party, led by Lawrence Springborg.
- South Australia: Liberal Party, led by Steven Marshall.
- Tasmania: Australian Labor Party, led by Bryan Green.
- Victoria: Liberal Party, led by Matthew Guy.
- Western Australia: Australian Labor Party, led by Mark McGowan.
- It is sometimes styled as "Her Majesty's Loyal Opposition" to show that, although the group may be against the sitting government, it remains loyal to the Crown (the embodiment of the Australian state), and thus to Australia.
- Maiden, Samantha (18 November 2010). "Altar egos clash over Wills and Babykins". The Australian. Retrieved 31 March 2011.