Preamble to the Constitution Act, 1867

The Preamble to the Constitution Act, 1867 (French: Préambule de la Loi constitutionnelle de 1867) is a provision of the Constitution of Canada, setting out some of the general goals and principles of the Act. Although the Preamble is not a substantive provision, the courts have used it as a guide to the interpretation of the Constitution of Canada, particularly unwritten constitutional principles which inform the history and meaning of the Constitution.

The Constitution Act, 1867 is the constitutional statute which established Canada. Originally named the British North America Act, 1867, the Act continues to be the foundational statute for the Constitution of Canada, although it has been amended many times since 1867. It is now recognised as part of the supreme law of Canada.