Act of Parliament in the context of "Short title"

The Constitution of Canada (French: Constitution du Canada) is the supreme law in Canada. It outlines Canada's system of government and the civil and human rights of those who are citizens of Canada and non-citizens in Canada. Its contents are an amalgamation of various codified acts, treaties between the Crown and Indigenous Peoples (both historical and modern), uncodified traditions and conventions. Canada is one of the oldest constitutional monarchies in the world.

The Constitution of Canada comprises core written documents and provisions that are constitutionally entrenched, take precedence over all other laws and place substantive limits on government action; these include the Constitution Act, 1867 (formerly the British North America Act, 1867) and the Canadian Charter of Rights and Freedoms. The Constitution Act, 1867 provides for a constitution "similar in principle" to the largely unwritten constitution of the United Kingdom, recognizes Canada as a constitutional monarchy and federal state, and outlines the legal foundations of Canadian federalism.

The Government of Ireland Act 1920 (10 & 11 Geo. 5. c. 67) was an act of the Parliament of the United Kingdom. The Act's long title was "An Act to provide for the better government of Ireland"; it is also known as the Fourth Home Rule Bill or (inaccurately) as the Fourth Home Rule Act and informally known as the Partition Act. The Act was intended to partition Ireland into two self-governing polities: the six north-eastern counties were to form "Northern Ireland", while the larger part of the country was to form "Southern Ireland". Both territories were to remain part of the United Kingdom of Great Britain and Ireland and provision was made for their future reunification through a Council of Ireland. The Act was passed by the British Parliament in November 1920, received royal assent in December and came into force on 3 May 1921.

The smaller Northern Ireland was duly created with a devolved government and remained in the UK. The larger Southern Ireland was not recognised by most of its citizens, who instead recognised the self-declared Irish Republic in the ongoing Irish War of Independence. The conflict resulted in the Anglo-Irish Treaty in December 1921. Under the treaty, Ireland would leave the UK (with the option for Northern Ireland to opt out and remain in the UK, which it immediately did) in December 1922 and become the Irish Free State, which would later evolve into today's Republic of Ireland. The institutions set up under this Act for Northern Ireland continued to function until they were suspended by the British parliament in 1972 as a consequence of the Troubles.

The Australia Act 1986 is the short title of each of a pair of separate but related pieces of legislation: one an act of the Parliament of Australia, the other an act of the Parliament of the United Kingdom. The Acts eliminated the ability for the United Kingdom to legislate with effect in Australia, for the UK to be involved in any Australian government, and for an appeal from any Australian court to a British court. This act formally severed all legal ties between Australia and the United Kingdom.

In Australia they are referred to, respectively, as the Australia Act 1986 (Cth) and the Australia Act 1986 (UK). These nearly identical Acts were passed by the two parliaments, because of uncertainty as to whether the Commonwealth Parliament alone had the ultimate authority to do so. They were enacted using legislative powers conferred by enabling acts passed by the parliaments of every Australian state. The acts came into effect simultaneously, on 3 March 1986.

The Constitution of Australia (also known as the Commonwealth Constitution) is the fundamental law that governs the political structure of Australia. It is a written constitution, which establishes the country as a federation under a constitutional monarchy governed with a parliamentary system. Its eight chapters set down the structure and powers of the three constituent parts of the federal level of government: the Parliament, the Executive Government and the Judicature.

The Constitution was drafted between 1891 and 1898 at a series of conventions conducted by representatives of the six self-governing British colonies in Australia: New South Wales, Victoria, Queensland, Western Australia, South Australia and Tasmania. This final draft was then approved by each state in a series of referendums from 1898 to 1900. The agreed constitution was transmitted to London where, after some minor modifications, it was enacted as section 9 of the Commonwealth of Australia Constitution Act 1900, an act of the Parliament of the United Kingdom. It came into effect on 1 January 1901, at which point the six colonies became states within the new Commonwealth of Australia.

The system of racial segregation and oppression in South Africa known as apartheid was implemented and enforced by many acts and other laws. This legislation served to institutionalize racial discrimination and the dominance by white people over people of other races. While the bulk of this legislation was enacted after the election of the National Party government in 1948, it was preceded by discriminatory legislation enacted under earlier British and Afrikaner governments. Apartheid is distinguished from segregation in other countries by the systematic way in which it was formalized in law.

The House of Lords Reform Act 2014 is an Act of Parliament of the United Kingdom. The Act was a private member's bill. It received royal assent on 14 May 2014. The Act allows members of the House of Lords to retire or resign – actions previously constitutionally impossible for life peers. It also makes provision to exclude members who commit serious criminal offences resulting in a jail sentence of at least one year, and members who fail to attend the House for a whole session, provided that the session is longer than 6 months. The Act does not have retrospective effect.

As of November 2025, 203 peers have resigned or retired, and a further 16 peers were removed under the Act's provisions regarding non-attendance. The first peer to resign was Julian Grenfell, 3rd Baron Grenfell, on 1 October 2014.

The United Kingdom constitutional law concerns the governance of the United Kingdom of Great Britain and Northern Ireland. With the oldest continuous political system on Earth, the British constitution is not contained in a single code but principles have emerged over centuries from common law statute, case law, political conventions and social consensus. In 1215, Magna Carta required the King to call "common counsel" or Parliament, hold courts in a fixed place, guarantee fair trials, guarantee free movement of people, free the church from the state, and it enshrined the rights of "common" people to use the land. After the English Civil War and the Glorious Revolution 1688, Parliament won supremacy over the monarch, the church and the courts, and the Bill of Rights 1689 recorded that the "election of members of Parliament ought to be free". The Act of Union 1707 unified England, Wales and Scotland, while Ireland was joined in 1800, but the Republic of Ireland formally separated between 1916 and 1921 through bitter armed conflict. By the Representation of the People (Equal Franchise) Act 1928, almost every adult man and woman was finally entitled to vote for Parliament. The UK was a founding member of the International Labour Organization (ILO), the United Nations, the Commonwealth, the Council of Europe, and the World Trade Organization (WTO).

The constitutional principles of parliamentary sovereignty, the rule of law, democracy and internationalism guide the UK's modern political system. The central institutions of modern government are Parliament, the judiciary, the executive, the civil service and public bodies which implement policies, and regional and local governments. Parliament is composed of the House of Commons, elected by voter constituencies, and the House of Lords which is mostly appointed on the recommendation of cross-political party groups. To make a new Act of Parliament, the highest form of law, both Houses must read, amend, or approve proposed legislation three times. The judiciary is headed by a twelve-member Supreme Court. Underneath are the Court of Appeal for England and Wales, the Court of Appeal in Northern Ireland, and the Court of Session for Scotland. Below these lie a system of high courts, Crown courts, or tribunals depending on the subject in the case. Courts interpret statutes, progress the common law and principles of equity, and can control the discretion of the executive. While the courts may interpret the law, they have no power to declare an Act of Parliament unconstitutional. The executive is headed by the Prime Minister, who must command a majority in the House of Commons. The Prime Minister appoints a cabinet of people who lead each department, and form His Majesty's Government. The King himself is a ceremonial figurehead, who gives royal assent to new laws. By constitutional convention, the monarch does not usurp the democratic process and has not refused royal assent since the Scottish Militia Bill in 1708. Beyond the Parliament and cabinet, a civil service and a large number of public bodies, from the Department of Education to the National Health Service, deliver public services that implement the law and fulfil political, economic and social rights.