The relevance of the study is determined by the need for a comprehensive description of the stylistic variability of Canadian French, which is shaped by bilingualism, regional differentiation, and active contact processes with the English language. The aim of the study was to establish the functional, structural, and sociolinguistic parameters of diaphasic registers that define the contemporary French-speaking space in Canada. The research methodology was based on a qualitative analysis of public, media, and institutional texts representing different registers, as well as on a structural-functional approach to their comparison. The analysis covered four main stylistic levels of Canadian French: formal (institutionnel), neutral (courant), colloquial (familier), and joual as a separate diaphasic-diatopic variety. Their functional interaction, coexistence in a single communicative space, and specific differentiation, manifested at the level of vocabulary, phonetics, syntax, and pragmatic characteristics of French Canadians’ speech, were established. The study includes a description of the lexical, syntactic, phonetic, and pragmatic properties of registers and the peculiarities of their contextual functioning. The results demonstrate that the formal register ensures the stability and normativity of institutional communication; the neutral register acts as an interregional mediator, combining standardization with Canadian markers; the colloquial register is characterized by phonetic reductions, pragmatic particles, and a high frequency of Anglicisms; joual functions as a local cultural-identity variety with its own lexical-phonetic complex. The study shows that diaphasic variation in French-speaking Canada is a key mechanism for the formation of linguistic identity and reflects the complex interaction of social, regional, and contact factors. The results obtained are of practical importance for the further description of the Canadian French norm, the development of resources for teaching French as a second language, the compilation of regional corpora, and the conduct of comparative sociolinguistic studies.