InAustralian parliamentary practice, theOpposition or theOfficial Opposition consists of the second largest party or coalition of parties in theAustralian House of Representatives, with its leader being given the titleLeader of the Opposition. The Opposition serves the same function as theofficial opposition in otherCommonwealth of Nations monarchies that follow the Westminster conventions and practices. It is seen as the alternative government and the existing administration's main opponent in theAustralian Parliament and at a general election. By convention, the Opposition Leader in the federal Parliament comes from theHouse of Representatives, as does the deputy, although the Government and Opposition may also both have leaders in theSenate. The Opposition is sometimes styled asHis Majesty's Loyal Opposition^[1] 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.

The current Opposition at a federal level is the centre-rightLiberal Party/National PartyCoalition, led bySussan Ley.

The opposition parties and leaders in theAustralian states and territories are:

• List of federal Opposition Leaders
• Shadow Ministry of Australia

• Opposition of Australia

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• Use Australian English from February 2017
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• Use dmy dates from July 2016