AbsTRACT. In this article, we examine professional collaboration among a sample of teachers working in three distinct language contexts in British Columbia (the anglophone schools, the francophone schools and dual-track schools that house the French Immersion programs alongside English programs). The data were gathered using interviews and questionnaires with school principals, teachers and administrators as part of a larger pan-Canadian study on the évolution of school personnel (2002)(2003)(2004)(2005)(2006)(2007). The data were analyzed using SPSS and N6 software packages. The analysis reveals that teachers working in French Immersion programs in dual-track schools collaborate the most, particularly with respect to the exchange and construction of pedagogical materials and planning instruction. Conversely, it is in French schools that the degree of collaboration is the weakest. We suggest that sociological and identity issues related to the challenges and constraints of teaching in a minority language setting can explain the differences noted in the level of collaboration between teachers in the three contexts. La collaboration professionnelle entre les enseignants est une dimension centrale dans la construction d'une communauté professionnelle, laquelle contribue en retour à insuffler un dynamisme et une couleur particulière à l'organisation scolaire et à l'action éducative de ses agents. Plusieurs chercheurs, entre autres (Glazer et Hannafin, 2006;Creese, 2005;Little, 2003;Pelletier, 2003;Tardif et Lessard, 1999;Grimmett, 1996;Da Costa, 1995;Firestone et Pennell, 1993), ont mis en lumière le rôle important que joue la communauté professionnelle dans le développement professionnel des éducateurs. Celle-ci oriente le fonctionnement de l'école et influence la manière dont les enseignants s'engagent dans leur pratique professionnelle, tout en contribuant à briser leur isolement. De plus, l'engagement professionnel influence en partie l'expérience éducative des étudiants. Little (2003) est d'avis que l'examen critique et collectif des stratégies pédagogiques est une condition essentielle de l'amélioration de la pratique professionnelle :Researchers posit that conditions for improving teaching and learning are strengthened when teachers collectively question ineffective teaching routine, examine new conceptions of teaching and learning, find generative means to acknowledge and respond to difference and conflict, and engage in supporting one another's professional growth. (p. 1)