Parliamentary system 议会制
（重定向自Parliamentarily）
![Map of different governmental systems
Parliamentary monarchies in which authority is vested in a parliament.
Parliamentary republics where parliaments are effectively supreme over a separate head of state.
Parliamentary republics with an executive president elected by a parliament.](/Images/godic/202502/01/Forms_of_government_parliamentary.svg5451.png")
![The Palace of Westminster in London, United Kingdom. The Westminster system originates from the British Houses of Parliament.](/Images/godic/202502/01/Houses.of.parliament.overall.arp5451.jpg")
![The Reichstag Building in Berlin, Germany. The Consensus system is used in most of Western European countries.](/Images/godic/202502/01/Berlin_reichstag_CP5451.jpg")
![Statue of President Nelson Mandela of South Africa in Parliament Square, London](/Images/godic/202502/01/MandelaStatue5452.jpg")
A parliamentary system is a system of democratic governance of a state where the executive branch derives its democratic legitimacy from legislature (parliament) and is also held accountable to that legislature. In a parliamentary system, the head of state is normally a different person from the head of government. This is in contrast to a presidential system in a democracy, where the head of state often is also the head of government, and most importantly, the executive branch does not derive its democratic legitimacy from the legislature.