Raymond Mougeon's research focuses on the preservation of French in Ontario, as well as on the social and geographic diversity of its use. He has also studied the acquisition of French as a second language in Canada and the history of social variation in Québec French and French in France.
French is one of Canada’s two official languages. Although every province in Canada has people whose mother tongue is French, Québec is the only province where speakers of French are in the majority. In 2011, 7,054,975 people in Canada (21 per cent of the country’s population) had French as their mother tongue.