A multitude of languages have always been spoken in Canada. Prior to Confederation, the territories that would become Canada were home to over 70 distinct languages across 12 or so language families. Today, a majority of those indigenous languages are still spoken; however, most are endangered and only about 0.6% of the Canadian population report an indigenous language as their mother tongue. Since the establishment of the Canadian state, English and French have been the co-official languages and are, by far, the most-spoken languages in the country.

According to the 2021 census, English and French are the mother tongues of 56.6% and 20.2% of Canadians respectively. According to the 2016 census, a total of 86.2% of Canadians could conduct a conversation in English, while 29.8% could conduct a conversation in French. Under the Official Languages Act of 1969, both English and French have official status throughout Canada in respect of federal government services and most courts. All federal legislation is enacted bilingually. Provincially, only in New Brunswick are both English and French official to the same extent. French is Quebec's official language, although legislation is enacted in both French and English and court proceedings may be conducted in either language. English is the official language of Ontario, Manitoba and Alberta, but government services are available in French in many regions of each, particularly in regions and cities where Francophones form the majority. Legislation is enacted in both languages and courts conduct cases in both. In 2022, Nova Scotia recognized Mi'kmawi'simk as the first language of the province, and maintains two provincial language secretariats: the Office of Acadian Affairs and Francophonie (French language) and the Office of Gaelic Affairs (Canadian Gaelic). The remaining provinces (British Columbia, Saskatchewan, Prince Edward Island, and Newfoundland and Labrador) do not have an official provincial language but government is primarily English-speaking. Territorially, both the Northwest Territories and Nunavut have official indigenous languages alongside French and English: Inuktut (Inuktitut and Inuinnaqtun) in Nunavut and, in the NWT, nine others (Cree, Dënësųłıné, Dene Yatıé/Zhatıé, Gwich’in, Inuinnaqtun, Inuktitut, Inuvialuktun, Sahtúgot’įné Yatı̨́ / Shíhgot’įne Yatı̨́ / K’ashógot’įne Goxedǝ́, and Tłįchǫ Yatıì).

Canada's official languages commissioner (the federal government official charged with monitoring the two languages) said in 2009, "[I]n the same way that race is at the core of what it means to be American and at the core of an American experience and class is at the core of British experience, I think that language is at the core of Canadian experience."Official Languages Commissioner Graham Fraser is quoted in The Hill Times, August 31, 2009, p. 14. To assist in more accurately monitoring the two official languages, Canada's census collects a number of demolinguistic descriptors not enumerated in the censuses of most other countries, including home language, mother tongue, first official language, and language of work.

Canada's linguistic diversity extends beyond English, French and numerous indigenous languages. "In Canada, 4.7 million people (14.2% of the population) reported speaking a language other than English or French most often at home and 1.9 million people (5.8%) reported speaking such a language on a regular basis as a second language (in addition to their main home language, English or French). In all, 20.0% of Canada's population reported speaking a language other than English or French at home. For roughly 6.4 million people, the other language was an immigrant language, spoken most often or on a regular basis at home, alone or together with English or French whereas for more than 213,000 people, the other language was an indigenous language. Finally, the number of people reporting sign languages as the languages spoken at home was nearly 25,000 people (15,000 most often and 9,800 on a regular basis)."

Official languages

Home language: rates of language use 1971–2011

The percentage of the population speaking English, French or both languages most often at home has declined since 1986; the decline has been greatest for French. The proportion of the population who speak neither English nor French in the home has increased. Geographically, this trend remains constant, as usage of English and French have declined in both English and French speaking regions of the country, but French has declined more rapidly both inside and outside Quebec. The table below shows the percentage of the total Canadian population who speak Canada's official languages most often at home from 1971 to 2006.Given the large discrepancies in the data for both official languages and neither language in 1971 and 1981, it is reasonable to assume that the manner in which the data collected for these years was different from for 1986–2006 Note that there are nuances between "language most spoken at home", "mother-language" and "first official language": data is collected for all three, which together provide a more detailed and complete picture of language-use in Canada.

Use of English

In 2011, just under 21.5 million Canadians, representing 65% of the population, spoke English most of the time at home, while 58% declared it their mother language. English is the major language everywhere in Canada except Quebec and Nunavut, and most Canadians (85%) can speak English. While English is not the preferred language in Quebec, 51.7% of Québécois can speak English; a dramatic increase from 36.1% in 2016. Nationally, Francophones are five times more likely to speak English than Anglophones are to speak French – 44% and 9% respectively.Marmen, Louise and Corbeil, Jean-Pierre, "New Canadian Perspectives, Languages in Canada 2001 Census," Library and Archives Canada Cataloguing in Publication, Statistics Canada Cat. No. Ch3-2/8-2004, (Canadian Heritage, 2004), pg. 60. Only 3.2% of Canada's English-speaking population resides in Quebec—mostly in Montreal.

In 2011, 28.4 million Canadians had knowledge of English while only 21.6 million Canadians spoke it most often at home.1931–1991: Statistics Canada, The 1997 Canada Year Book, "3.14 Official Language Knowledge," Catalogue No. 11-402XPE/1997. 1996: Statistics Canada. Population by Knowledge of Official Languages (20% sample data), (table), 1996 Census of Population (Provinces, Census Divisions, Municipalities) (database), Using E-STAT (distributor). (accessed: June 28, 2010). 2001: Statistics Canada. Languages, Mobility and Migration, 2001 – Provinces and Territories in Canada (table), 2001 Census of Population (Provinces, Census Divisions, Municipalities) (database), Using E-STAT (distributor). (accessed: June 28, 2010) 2006: Statistics Canada. Languages, Mobility and Migration, 2006 – Provinces and Territories in Canada (table), 2006 Census of Population (Provinces, Census Divisions, Municipalities) (database), Using E-STAT (distributor). (accessed: June 28, 2010).

Use of French

In 2011, just over 7.1 million Canadians spoke French most often at home, this was a rise of 4.2%, although the proportion of people in Canada who spoke French "most often" at home fell slightly from 21.7% to 21.5% . Of these, about 6.1 million or 85% resided in Quebec. Outside Quebec, the largest French-speaking populations are found in New Brunswick (which is home to 3.1% of Canada's Francophones) and Ontario (4.2%, residing primarily in the eastern and northeastern parts of the province and in Toronto and Ottawa). Overall, 22% of people in Canada declare French to be their mother language, while one in three Canadians speak French and 70% are unilingual Anglophones. Smaller indigenous French-speaking communities exist in some other provinces. For example, a vestigial community exists on Newfoundland's Port au Port Peninsula, a remnant of the "French Shore" along the island's west coast.

The percentage of the population who speak French both by mother tongue and home language has decreased over the past three decades. Whereas the number of those who speak English at home is higher than the number of people whose mother tongue is English, the opposite is true for Francophones. There are fewer people who speak French at home, than learned French after birth.Statistics Canada, The Evolving Linguistic Portrait, 2006 Census, Catalogue no. 97-555-XIE, Ottawa, December 2007, pp. 15–16.

Ethnic diversity is growing in French Canada but still lags behind the English-speaking parts of the country. In 2006, 91.5% of Quebecers considered themselves to be of either "French" or "Canadian" origin. As a result of the growth in immigration, since the 1970s, from countries in which French is a widely used language, 3.4% of Quebecers indicated that they were of Haitian, Belgian, Swiss, Lebanese or Moroccan origin.Statistics Canada, Place of birth for the immigrant population by period of immigration, 2006 counts and percentage distribution, for Canada, provinces and territories – 20% sample data, 2006 Census of Population . Other groups of non-francophone immigrants (Irish Catholics, Italian, Portuguese, etc.) have also assimilated into French over the generations. The Irish, who started arriving in large numbers in Quebec in the 1830s, were the first such group, which explains why it has been possible for Quebec to have had five premiers of Irish ethnic origin: John Jones Ross (1884–87), Edmund James Flynn (1896–97), Daniel Johnson Sr. (1966–68), Pierre-Marc Johnson (1985), and Daniel Johnson Jr. (1994).

In 1991, due to linguistic assimilation of Francophones outside Quebec, over one million Canadians who claimed English as their mother tongue were of French ethnic origin (1991 Census).

Bilingualism and multilingualism versus English–French bilingualism

According to the 2011 census, 98.2% of Canadian residents have knowledge of one or both of the country's two official languages. Between 2006 and 2011, the number of persons who reported being able to conduct a conversation in both of Canada's official languages increased by nearly 350,000 to 5.8 million. The bilingualism rate of the Canadian population edged up from 17.4% in 2006 to 17.5% in 2011. This growth of English-French bilingualism in Canada was mainly due to the increased number of Quebecers who reported being able to conduct a conversation in English and French.

Bilingualism with regard to nonofficial languages also increased, most individuals speaking English plus an immigrant language such as Punjabi or Mandarin.Bilingualism growing, but not in French and English

Geographic distribution of English–French bilingualism

Below shows the bilingual horseshoe as of 2021.