French Canadians, referred to as Canadiens mainly before the nineteenth century, are an ethnic group descended from French colonists first arriving in France's colony of Canada in 1608. The vast majority of French Canadians live in the province of Quebec.

During the 17th century, French settlers originating mainly from the west and north of France settled Canada. It is from them that the French Canadian ethnicity was born. During the 17th to 18th centuries, French Canadians expanded across North America and colonized various regions, cities, and towns. As a result, people of French Canadian descent can be found across North America. Between 1840 and 1930, many French Canadians emigrated to New England, an event known as the Grande Hémorragie.

French Canadians get their name from the French colony of Canada, the most developed and densely populated region of New France during the period of French colonization in the 17th and 18th centuries. The original use of the term Canada referred to the area of present-day Quebec along the St. Lawrence River, divided in three districts (Québec, Trois-Rivières, and Montréal), as well as to the Pays d'en Haut (Upper Countries), a vast and thinly settled territorial dependence north and west of Montreal which covered the whole of the Great Lakes area.

From 1535 to the 1690s, Canadien was a word used by the French to refer to the First Nations they had encountered in the St. Lawrence River valley at Stadacona and Hochelaga; however, First Nations groups did not refer to themselves as Canadien. At the end of the 17th century, Canadien became an ethnonym distinguishing the French inhabitants of Canada from those of France. At the end of the 18th century, to distinguish between the English-speaking population and the French-speaking population, the terms English Canadian and French Canadian emerged. During the Quiet Revolution of the 1960s to 1980s, inhabitants of Quebec began to identify as Québécois instead of simply French Canadian.

French settlers from Normandy, Perche, Beauce, Brittany, Maine, Anjou, Touraine, Poitou, Aunis, Angoumois, Saintonge, and Gascony were the first Europeans to permanently colonize what is now Quebec, parts of Ontario, Acadia, and select areas of Western Canada, all in Canada (see French colonization of the Americas). Their colonies of New France (also commonly called Canada) stretched across what today are the Maritime provinces, southern Quebec and Ontario, as well as the entire Mississippi River Valley.

The first permanent European settlements in Canada were at Port Royal in 1605 and Quebec City in 1608 as fur trading posts. The territories of New France were Canada, Acadia (later renamed Nova Scotia), and Louisiana; the mid-continent Illinois Country was at first governed from Canada and then attached to Louisiana. The inhabitants of the French colony of Canada (modern-day Quebec) called themselves the Canadiens, and came mostly from northwestern France. The early inhabitants of Acadia, or Acadians (Acadiens), came mostly but not exclusively from the southwestern regions of France.

Canadien explorers and fur traders would come to be known as coureurs des bois and voyageurs, while those who settled on farms in Canada would come to be known as habitants. Many French Canadians are the descendants of the King's Daughters (Filles du Roi) of this era. A few also are the descendants of mixed French and Algonquian marriages (see also Metis people and Acadian people). During the mid-18th century, French explorers and Canadiens born in French Canada colonized other parts of North America in what are today the states of Louisiana, Mississippi, Missouri, Illinois, Vincennes, Indiana, Louisville, Kentucky, the Windsor-Detroit region and the Canadian prairies (primarily Southern Manitoba).

After the 1760 British conquest of New France in the French and Indian War (known as the Seven Years' War in Canada), the French-Canadian population remained important in the life of the colonies. The British gained Acadia by the Treaty of Utrecht in 1713. It took the 1774 Quebec Act for French Canadians to regain the French civil law system, and in 1791 French Canadians in Lower Canada were introduced to the parliamentary system when an elected Legislative Assembly was created. The Legislative Assembly having no real power, the political situation degenerated into the Lower Canada Rebellions of 1837–1838, after which Lower Canada and Upper Canada were unified. Some of the motivations for the union was to limit French-Canadian political power and at the same time transferring a large part of the Upper Canadian debt to the debt-free Lower Canada. After many decades of British immigration, the Canadiens became a minority in the Province of Canada in the 1850s.