The Constitution Act, 1982 (French: Loi constitutionnelle de 1982) is a part of the Constitution of Canada. The Act was introduced as part of Canada's process of patriating the constitution, introducing several amendments to the British North America Act, 1867, including re-naming it the Constitution Act, 1867. In addition to patriating the Constitution, the Constitution Act, 1982 enacted the Canadian Charter of Rights and Freedoms; guaranteed rights of the Aboriginal peoples of Canada; provided for future constitutional conferences; and set out the procedures for amending the Constitution in the future.

This process was necessary because, after the Statute of Westminster, 1931, Canada allowed the British Parliament to retain the power to amend Canada's constitution, until Canadian governments could agree on an all-in-Canada amending formula. In 1981, following substantial agreement on a new amending formula, the Parliament of Canada requested that the Parliament of the United Kingdom give up its power to amend the Constitution of Canada. The enactment of the Canada Act 1982 by the British Parliament in March 1982 confirmed the Patriation of the Constitution and transferred to Canada the power of amending its own Constitution.On April 17, 1982, Queen Elizabeth II and Prime Minister Pierre Trudeau, as well as the Minister of Justice, Jean Chrtien, and Andr Ouellet, the Registrar General, signed the Proclamation which brought the Constitution Act, 1982 into force. The proclamation confirmed that Canada had formally assumed authority over its constitution, the final step to full sovereignty.As of 2022, the Government of Quebec has never formally approved of the enactment of the act, though the Supreme Court concluded that Quebec's formal consent was never necessary and 15 years after ratification the government of Quebec "passed a resolution authorizing an amendment." Nonetheless, the lack of formal approval has remained a persistent political issue in Quebec. The Meech Lake and Charlottetown Accords were designed to secure approval from Quebec, but both efforts failed to do so.

The Canada Act 1982 (1982 c. 11; French: Loi de 1982 sur le Canada) is an act of the Parliament of the United Kingdom and one of the enactments which make up the Constitution of Canada. It was enacted at the request of the Senate and House of Commons of Canada to patriate Canada's Constitution, ending the power of the British Parliament to amend the Constitution. The Act also formally ended the "request and consent" provisions of the Statute of Westminster 1931 in relation to Canada, whereby the British parliament had a general power to pass laws extending to Canada at its own request.

Annexed as Schedule B to the act is the text of the Constitution Act, 1982, in both of Canada's official languages (i.e. English and French). Because of the requirements of official bilingualism, the body of the Canada Act itself is also set out in French in Schedule A to the act, which is declared by s. 3 to have "the same authority in Canada as the English version thereof".