The British North America Acts 18671975 are a series of Acts of Parliament that were at the core of the constitution of Canada. Most were enacted by the Parliament of the United Kingdom and some by the Parliament of Canada. In Canada, some of the Acts were repealed in Canada by the Constitution Act, 1982. The rest were renamed the Constitution Acts and amended, with those changes only having effect in Canada. The Canadian versions of the Constitution Acts make up the Constitution of Canada, and can only be amended in Canada.

The British versions of the Acts which remain in force in Britain are ordinary British statutes. They can be amended by the British Parliament, but those amendments would not have any effect in Canada. They retain their original names and do not include any amendments made in Canada since 1982.

The term "British North America" (BNA) refers to the British colonies in North America, after 1783.

The Famous Five (French: Célèbres cinq), also known as The Valiant Five, and initially as The Alberta Five, were five prominent Canadian suffragists who advocated for women and children: Henrietta Muir Edwards, Nellie McClung, Louise McKinney, Emily Murphy, and Irene Parlby. On August 27, 1927, they petitioned the federal government to refer the issue of the eligibility of women to be senators to the Supreme Court of Canada. This petition was the foundation of the Persons Case, a leading constitutional decision. Although most Canadian women had the vote in federal elections and all provinces but Quebec by 1927, the case was part of a larger drive for political equality. This was the first step towards equality for women in Canada and was the start to the first wave of feminism.

The question the federal government posed to the Supreme Court was: "Does the word 'Persons' in Section 24 of the British North America Act, 1867, include female persons?" In 1928, the Supreme Court unanimously held that women were not "qualified persons" within the meaning of s. 24 of the British North America Act, 1867. The five women appealed that ruling to the Judicial Committee of the Privy Council, at that time the highest court of appeal in the British Empire. This attempt failed and the court deemed women not qualified for this status. On October 18, 1929, the Judicial Committee overruled the Supreme Court and held that women were "qualified persons" and eligible to be appointed to the Senate.

Some saw this as "radical change"; others saw it as a restoration of the original framing of the English constitutional documents, including the 1689 Bill of Rights, which uses only the term person, not the term man (or woman for that matter). Some others have interpreted the Privy Council rule as causing a change in the Canadian judicial approach to the Canadian constitution, an approach that has come to be known as the "living tree doctrine".