
The Parliament of Australia is the legislative branch of the government of Australia. It consists of three elements: the Crown, the Senate and the House of Representatives. The combination of two elected chambers, in which the members of the Senate represent the states and territories while the members of the House represent electoral divisions according to population, is modelled on the United States Congress. Through both chambers, however, there is a fused executive, drawn from the Westminster system.

The Parliament of Barbados is the national legislature of Barbados. It is accorded legislative supremacy by Chapter V of the Constitution of Barbados. The Parliament is bicameral in composition and is formally made up of: Elizabeth II, Queen of Barbados, an appointed Senate, and an elected House of Assembly. Both houses sit in separate chambers in the Parliament Buildings, in the national capital Bridgetown in Saint Michael.

The Parliament of Canada is the federal legislature of Canada, seated at Parliament Hill in Ottawa, and is composed of three parts: the Monarch, the Senate, and the House of Commons. By constitutional convention, the House of Commons is dominant, with the Senate rarely opposing its will. The Senate reviews legislation from a less partisan standpoint and may initiate certain bills. The monarch or her representative, normally the governor general, provides royal assent to make bills into law.

The Parliament of England was the legislature of the Kingdom of England. The first English Parliament was convened in 1215, with the creation and signing of the Magna Carta, which established the rights of barons to serve as consultants to the king on governmental matters in his Great Council. In 1295, Parliament evolved to include nobles and bishops as well as two representatives from each of the counties and towns in England and, since 1282, Wales. This became the model for the composition of all future Parliaments. Over the course of the next century, the membership of Parliament was divided into the two houses it features today, with the noblemen and bishops encompassing the House of Lords and the knights of the shire and local representatives making up the House of Commons. During Henry IV’s time on the throne, the role of Parliament expanded beyond the determination of taxation policy to include the “redress of grievances,” which essentially enabled English citizens to petition the body to address complaints in their local towns and counties. By this time, citizens were given the power to vote to elect their representatives—the burgesses—to the House of Commons.

The Parliament of Great Britain was formed in May 1707 following the ratification of the Acts of Union by both the Parliament of England and the Parliament of Scotland. The Acts ratified the treaty of Union which created a new unified Kingdom of Great Britain and created the parliament of Great Britain located in the former home of the English parliament in the Palace of Westminster, near the City of London. This lasted nearly a century, until the Acts of Union 1800 merged the separate British and Irish Parliaments into a single Parliament of the United Kingdom with effect from 1 January 1801.

The Parliament of Ireland was the legislature of the Lordship of Ireland, and later the Kingdom of Ireland, from 1297 until 1800. It was modelled on the Parliament of England and from 1537 comprised two chambers: the House of Commons and the House of Lords. The Lords were members of the Irish peerage and bishops. The Commons was directly elected, albeit on a very restricted franchise. Parliaments met at various places in Leinster and Munster, but latterly always in Dublin: in Christchurch Cathedral, Dublin Castle, Chichester House (1661–1727), the Blue Coat School (1729–31), and finally a purpose-built Parliament House on College Green.

The Parliament of Malaysia is the national legislature of Malaysia, based on the Westminster system. The bicameral parliament consists of the Dewan Rakyat and the Dewan Negara (Senate). The Yang di-Pertuan Agong (King) as the Head of State is the third component of Parliament.

The New Zealand Parliament is the unicameral legislature of New Zealand, consisting of the Queen of New Zealand (Queen-in-Parliament) and the New Zealand House of Representatives. The Queen is usually represented by her governor-general. Before 1951, there was an upper chamber, the New Zealand Legislative Council. The New Zealand Parliament was established in 1854 and is one of the oldest continuously functioning legislatures in the world. It has met in Wellington, the capital of New Zealand, since 1865.

The Parliament of the Republic of Singapore and the President jointly make up the legislature of Singapore. Largely based from the Westminster system, the Parliament is unicameral and is made up of Members of Parliament (MPs) who are elected, as well as Non-constituency Members of Parliament (NCMPs) and Nominated Members of Parliament (NMPs) who are appointed. Following the 2020 general election, 93 MPs and two NCMPs were elected to the 14th Parliament. Nine NMPs will usually be appointed.

The Parliament of the United Kingdom is the supreme legislative body of the United Kingdom, the Crown dependencies and the British overseas territories. It alone possesses legislative supremacy and thereby ultimate power over all other political bodies in the UK and the overseas territories. Parliament is bicameral but has three parts, consisting of the sovereign (Crown-in-Parliament), the House of Lords, and the House of Commons. Both houses of Parliament meet in separate chambers at the Palace of Westminster in the City of Westminster, one of the inner boroughs of the capital city, London.