The Meech Lake Accord (French: Accord du lac Meech) was a series of proposed amendments to the Constitution of Canada negotiated in 1987 by Prime Minister Brian Mulroney and all 10 Canadian provincial premiers. It was intended to persuade the government of Quebec to symbolically endorse the 1982 constitutional amendments by providing for some decentralization of the Canadian federation.

The proposed amendments were initially popular and backed by nearly all political leaders. However, former Prime Minister Pierre Trudeau, feminist activists, and Indigenous groups raised concerns about the lack of citizen involvement in the Accord's drafting and its future effects on Canadian federalism, and support for the Accord began to decline. Changes in government in New Brunswick, Manitoba, and Newfoundland brought ministries to power that declined to accept the Accord. Further negotiations were conducted but tension increased between Quebec and the predominantly English-speaking provinces. A dramatic final meeting among first ministers a month before the Accord's constitutionally-mandated ratification deadline seemed to show renewed agreement on a second series of amendments that would address the concerns raised in the intervening debates. Despite this, the original accord would not gain acceptance in the Manitoba or Newfoundland legislatures in time for ratification.

Failure to pass the Accord greatly increased tensions between Quebec and the remainder of the country. The Quebec sovereignty movement gained renewed support for a time. The general aims of the Accord would be addressed in the Charlottetown Accord, which failed to gain a majority vote in a referendum.

In 1981, negotiations between the federal and provincial governments to patriate the constitution, led by Prime Minister Pierre Trudeau, resulted in an agreement that formed the basis of the Constitution Act, 1982. Quebec Premier René Lévesque and the Quebec National Assembly refused to approve the amendments and announced it would use a constitutional veto. The Supreme Court of Canada ruled in the Quebec Veto Reference that Quebec did not have a veto, and the Constitution Act, 1982 was operative in Quebec.

In the 1984 federal election, the Progressive Conservatives, led by Brian Mulroney, committed to eventually allowing the National Assembly to accept the amendments "with honour and enthusiasm," won a majority government. The apparent lessening of tension prompted Lévesque to attempt the "beau risque" of federal cooperation. His government split, leading to his resignation and the ultimate defeat of his sovereigntist Parti Québécois by the federalist Quebec Liberal Party of Robert Bourassa in the 1985 provincial election.

In his election platform, Bourassa outlined five conditions that would have to be met for Quebec to "sign on" to the constitution. They were recognition of Quebec's distinct character (as primarily Catholic and French-speaking), a veto for Quebec in constitutional matters, input from Quebec into the appointment of Supreme Court justices, co-determination of the number and selection of immigrants arriving in Quebec, and a limit on the federal spending power. Bourassa considered the demands practical, as all elements of the conditions had previously been offered by the federal government to Quebec on different occasions.

Bourassa and Mulroney, both pragmatic pro-business figures, had a far more congenial relationship than Trudeau and Lévesque had. Mulroney tasked Senator Lowell Murray with coordinating a possible agreement with the provinces. Bourassa announced that talks could proceed based on the five conditions, adding only the provision that "recognition of Quebec's distinct character" had to be an interpretive clause rather than a symbolic note in a revised preamble.^{[citation needed]}

At a meeting of the first ministers (the Prime Minister and provincial premiers) in Edmonton in August 1986, the ministers agreed to the "Edmonton Declaration". It stated that a "Quebec Round" of constitutional talks based on the five conditions would occur before further reforms would be undertaken.