Western Canada, also referred to as the Western provinces and commonly as the West, is a region of Canada that includes the four provinces west of the province of Ontario.

From west to east, the four provinces that comprise the region are British Columbia, Alberta, Saskatchewan, and Manitoba.

The latter three are collectively the Prairie Provinces, or simply the Prairies. British Columbia is also known as the Pacific Province, and in a more geographical sense is also referred to as the Pacific Slope and sometimes interchangeably with "the West Coast". Alberta and British Columbia are sometimes called "mountain provinces".

In some contexts, the term Western Canada may also include the territories of Yukon, Northwest Territories and Nunavut, although these are now more commonly grouped as the distinct region of Northern Canada.

Western Canada covers 2,908,433 square kilometres (1,122,952 sq mi), or approximately 29% of Canada's land area. It is more than four times as large as Texas and more than twice as large as the United Kingdom, Ireland, France, Spain and Portugal combined.

Canada ( /ˈkænədə/) is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean. Spanning over 9,900,000 km² (3,800,000 sq mi), Canada is the world's second-largest country by total area, and its common border with the United States is the longest land border in the world.

The land that is now Canada has been inhabited for millennia by various Aboriginal peoples. Beginning in the late 15th century, British and French colonial expeditions explored, and later settled, along the region's Atlantic coast. France ceded nearly all of its colonies in North America in 1763 after the Seven Years' War. In 1867, with the union of three British North American colonies through Confederation, Canada was formed as a federal dominion of four provinces. This began an accretion of provinces and territories and a process of increasing autonomy; the Canada Act 1982 severed the vestiges of legal dependence on Britain.