Canada has the tenth largest economy in the world (measured in US dollars at market exchange rates), is one of the world's wealthiest nations, and is a member of the Organization for Economic Co-operation and Development (OECD) and Group of Eight (G8). As with other developed nations, the Canadian economy is dominated by the service industry, which employs about three quarters of Canadians. Canada is unusual among developed countries in the importance of the primary sector, with the logging and oil industries being two of Canada's most important. Canada also has a sizable manufacturing sector, centred in Central Canada, with the automobile industry especially important.

Canada has one of the highest levels of economic freedom in the world. Today Canada closely resembles the U.S. in its market-oriented economic system, and pattern of production. As of June 2009, Canada's national unemployment rate stood at 8.6% as the effect of the world economic crisis settled in and more people looked for work. Provincial unemployment rates vary from a low of 3.6% in Alberta to a high of 15.6% in Newfoundland and Labrador; however, Newfoundland and Labrador was the only province with employment gains in June of 2009, up 2,500. At the same time, the unemployment rate edged up to 15.6% from previous lows as there were more people in the labour force. According to the Forbes Global 2000 list of the world's largest companies in 2008, Canada had 69 companies in the list, ranking 5th next to France. As of 2008, Canada’s total government debt burden is the lowest in the G8.

International trade makes up a large part of the Canadian economy, particularly of its natural resources. The United States is by far its largest trading partner, accounting for about 76% of exports and 65% of imports as of 2007. Canada's combined exports and imports ranked 8th among all nations in 2006.

Canada has considerable natural resources spread across its varied regions. In British Columbia, the forestry industry is of great importance, while the oil industry is important in Alberta and Newfoundland and Labrador. Northern Ontario is home to a wide array of mines, while the fishing industry has long been central to the character of the Atlantic provinces, though it has recently been in steep decline. Canada has mineral resources of coal, copper, iron ore, and gold.

These industries are increasingly becoming less important to the overall economy. Only some 4% of Canadians are employed in these fields, and they account for less than 6% of GDP.[citation needed] They are still paramount in many parts of the country. Many, if not most, towns in northern Canada, where agriculture is difficult, exist because of a nearby mine or source of timber. Canada is a world leader in the production of many natural resources such as gold, nickel, uranium, diamonds and lead. Several of Canada's largest companies are based in natural resource industries, such as EnCana, Cameco, Goldcorp, and Barrick Gold. The vast majority of these products are exported, mainly to the United States. There are also many secondary and service industries that are directly linked to primary ones. For instance one of Canada's largest manufacturing industries is the pulp and paper sector, which is directly linked to the logging industry.

The relatively large reliance on natural resources has several effects on the Canadian economy and Canadian society. While manufacturing and service industries are easy to standardize, natural resources vary greatly by region. This ensures that differing economic structures developed in each region of Canada, contributing to Canada's strong regionalism. At the same time the vast majority of these resources are exported, integrating Canada closely into the international economy. Howlett and Ramesh argue that the inherent instability of such industries also contributes to greater government intervention in the economy, to reduce the social impact of market changes.

Such industries also raise important questions of sustainability. Despite many decades as a leading producer, there is little risk of depletion. Large discoveries continue to be made, such as the massive nickel find at Voisey's Bay. Moreover the far north remains largely undeveloped as producers await higher prices or new technologies as many operations in this region are not yet cost effective. In recent decades Canadians have become less willing to accept the environmental destruction associated with exploiting natural resources. High wages and Aboriginal land claims have also curbed expansion. Instead many Canadian companies have focused their exploration and expansion activities overseas where prices are lower and governments more accommodating. Canadian companies are increasingly playing important roles in Latin America, Southeast Asia, and Africa.

The exploitation of renewable resources have raised concerns in recent years. After decades of escalating overexploitation the cod fishery all but collapsed in the 1990s, and the Pacific salmon industry also suffered greatly. The logging industry, after many years of activism, has in recent years moved to a more sustainable model.