This is a List of Australian Leaders of Her Majesty's Loyal Opposition (more commonly Leader of the Opposition), who in Australian Federal Politics is a Member of Parliament in the House of Representatives. The position is usually held by the leader of the party that has the most seats but is not a part of the Government. When in Parliament the Leader of the Opposition sits on the left-hand side of the table in the centre, in front of the Opposition and opposite the Prime Minister. The Prime Minister is usually the leader of the party, or coalition of parties, with the most seats in Parliament, and thus is the leader of the Government. The leader is elected by the Opposition Party according to its rules. A new Opposition Leader may be elected when the incumbent dies, resigns or is challenged for the leadership.
The Commonwealth of Australia is a constitutional monarchy with a parliamentary system and is based on the Westminster model. The term Opposition has a specific meaning in the parliamentary sense, in its formal title of Her Majesty's Loyal Opposition. This is an important component of the Westminster system: the Opposition directs its criticism at the Government and attempts to defeat and replace the Government. The Opposition is therefore the 'Government in waiting' and it is a formal part of the parliamentary system, as is the Government. It is in opposition to the Government, but not to the Crown, hence the term 'Loyal Opposition'.
The current Deputy Leader of The Opposition is Tanya Plibersek of the Australian Labor Party following her election on 14 October 2013 by the Labor Caucus. Tanya Plibersek is the fourth woman to hold the position of Deputy Opposition Leader, and she is the second woman to be a female Party Deputy Leader concurrent with the other major political party (with current Liberal Deputy Leader being Julie Bishop). The first women concurrently being Julia Gillard as Deputy Prime Minister and Julie Bishop as Deputy Opposition Leader, which occurred between 2007 to 2010.