Canada is one of the largest agricultural producers and exporters in the world. As with other developed nations, the proportion of the population and GDP devoted to agriculture fell dramatically over the 20th century but it remains an important element of the Canadian economy.

A wide range of agriculture is practiced in Canada, from sprawling wheat fields of the prairies to wineries of the Okanagan valley. In the federal government, overview of Canadian agriculture is the responsibility of the department of Agriculture and Agri-Food.

Canadian farms, fisheries and ranches produce a wide variety of crops, livestock, food, feed, fiber, fuel and other goods by the systematic raising of plants and animals which are dependent upon the geography of the province. In 2001 farms numbered only 246,923 at a size of 676 acres (2.74 km²) as the production of food and fiber for human or livestock sustenance has evolved into intensive and industrial practices. As of 2002, wheat constituted the largest crop area at 12.6%. Canadian farmers received a record $36.3 billion in 2001 from livestock, crop sales and program payments. In 2001, the accrued net income of farm operators from farm production amounted to 1,633 million dollars, which amounts to 0.147% of Canada's gross domestic product at market prices which is 1,108,200 million dollars. Fisheries are also playing an important role while forestry plays a secondary role. Canada's evolution has abandoned subsistence techniques and now sees a mere 3% of Canada's population employed as a mechanized industrial farmer who are able feed the rest of the nation's population of 30,689.0 thousand people (2001) as well as export to foreign markets. (Canada's estimated population was 32,777,300 on January 1, 2007).

The marketing and economic movement of Canada's various agriculture commodities has been a challenge. Domestic trade encompasses providing goods within Canada provincially and inter-provincial. Support agencies and services such as storage, railways, warehouses, stores, banking institutions all effect domestic trade. Trade of wheat from the Canada's prairies are monitored by the Canadian Wheat Board. Canada's depression of 1882-1897 brought a low of 64¼ cents per bushel ($24/t) as of 1893. This era during Laurier's administration saw thousands of homesteads cancelled. Wheat prices soared during World War I. In 1928, Canada exported high quantities of wheat, flour, and goods. The depression took its toll on Canada as exports sunk to approximately 40% of their 1928 amount. European markets stopped needing to import Canadian wheat as they started growing their own varieties, and then World War II events put a blockade on trade to European markets. Canada became more of an industrial entity during the time of this industrial revolution, and less of an agricultural nation. Following World War II the United Kingdom entered into contract for a large amount of agricultural commodities such as bacon, cheese, wheat, oats and barley. After the United Kingdom, the United States is Canada's largest external trade partner. Between 1943 and 1953, the average export of Canadian wheat was 347,200,000 bushels (9,449,000 t). The three year International Wheat Agreement of 1955, included exports of wheat or flour to 28 of 44 importing countries including Germany, Japan, Belgium, UK, and the Netherlands.

The depression and drought of the Dirty Thirties was devastating. This drought resulted in a mass exodus of population from the prairies, as well as new agricultural practices such as soil conservation, and crop rotation.

Soil conservation practices such as crop rotation, cover crops, and windbreaks to name a few were massively developed and set in forth upon recovering from the drought experiences of the dirty thirties. Literally layers and layers of topsoil would be blowing away during this time. Bow River Irrigation Project, Red Deer River Project and the St. Mary Irrigation project of Alberta, were a few of the major projects undertaken by the Prairie Farm Rehabilitation Act (P.F.R.A.) resulting in reservoirs, and distribution systems. A current project is Liming (soil) soil liming at the Land Resource Research Institute. Wheat diseases such as wheat bunt and stinking smut can be successfully treated with a fungicide. Disease of plants and animals can break an agricultural producer. Tuberculosis in animals was an early threat, and cattle needed to be tested, and areas accredited in 1956. The newer disease such as chronic wasting disease or transmissible spongiform encephalopathy (TSE) affects both elk and deer. Elk and deer raising is a pioneer field of domestication, has had a setback with this disease. Mad cow disease in cattle and scrapie of sheep are monitored by the Canadian Food Inspection Agency. The poultry sector was plagued by Pullorum disease, and by controlling the flock via poultry husbandry, this disease has been brought under control.

Plants whose traits can be modified to survive a disease or insect have made inroads into Canadian agricultural practices. Cereal rusts which can destroy the majority of areas seeded to wheat, was controlled in 1938 by breeding strains which were rust-resistant. This strain was successful until around 1950, when again a new variety of rust broke out, and again a new species of wheat called Selkirk was developed which was rust resistant. Biotechnology is the center of new research and regulations affecting agriculture this century.