A parliamentary leader is a political title or a descriptive term used in various countries to the person leading a caucus (or parliamentary group) in a legislative body, whether it be a national or sub-national legislature. A party leader may be the same person as the parliamentary leader, or the roles may be separated.
In many countries, the position of leader of a political party (that is, the organisational leader) and leader of a parliamentary group are separate positions, and while they are often held by the same person, this is not always or automatically the case. If the party leader is a member of the government, holds a different political office outside the parliamentary body in question, or no political office at all, the position of parliamentary leader is frequently held by a different person.
In English, the leader may be referred to as a "parliamentary chairman", "group leader" or simply "parliamentary leader", among other names.
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A parliamentary leader is chosen in Canadian politics to lead their caucus in a legislative body, whether it be the House of Commons or a provincial legislature. They serve as interim legislative leaders, when a party leader either has no seat in the legislative body, during a transition period preceding, or following a leadership contest.
Each of the seven political groups of the European Parliament has its own group leader. The groups within the European Parliament are often very broad, so the position of the group leader is a unifying one—they may help to consolidate MEPs with similar outlooks ahead of important votes. The groups are organisationally separate from a European political party, and multiple parties often ally as a single group, thus the distinction between a party and a parliamentary leader is usually strict.
In German politics, leaders of the major parties have often been heads of government of the various states rather than members of the national parliament. Hence, the position of parliamentary leader in the federal parliament (Germany also has 16 state parliaments) is often occupied by a different person. The parliamentary leader has the supreme responsibility for coordinating the work of the MPs representing his or her party. Even when the party leader is a member of the national parliament, the parliamentary leader can be a different person. For instance, Friedrich Merz was parliamentary leader while Angela Merkel was party leader for some years while the CDU was in opposition. If the party leader is the Chancellor or a member of the government, another person always is the parliamentary leader.
In British politics, the leader of a party is typically the same person as the parliamentary leader. The leader may not fully control the party bureaucracy. The leader may be chosen by MPs from among their number, or elected by the wider party membership at a party conference, but once elected must retain the support of the parliamentary party. Similarly, the position of prime minister may be given to the parliamentary leader (viz. party leader) of the largest political party in parliament, with the expectation they will be able secure and retain the confidence of a majority of MPs.
Some smaller parties have parliamentary leaders in the national parliament (in Westminster) who are separate from the party leaders—the party leader may hold office in a devolved (sub-national) parliament or assembly.
Australia and New Zealand
In Australian and New Zealand politics, the party figure commonly described as "leader" is usually an MP responsible for managing the party's business within parliament. Party constitutions will typically distinguish between the parliamentary leader and the organisational leader (who typically is outside of parliament), with the latter often termed a "federal president" or "party president". The two roles are organisationally distinct even if close cooperation is expected.
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