The Legislative Assembly of the Province of Canada was the lower house of the Parliament of the Province of Canada. The Province of Canada consisted of the former province of Lower Canada, then known as Canada East (now Quebec), and Upper Canada, then known as Canada West (now Ontario). It was created by the Act of Union 1840.
Canada East and Canada West each elected 42 members to the assembly for the first four parliaments. In 1853, following the 1851 Canadian census, the number of seats in the assembly was increased by the 4th Parliament of the Province of Canada from 84 to 130, 65 for each section, even though Canada West had a slightly larger population. The Parliamentary Representation Act of June 1853 was to take effect with the election for the 5th Parliament of the Province of Canada.