Language is an important aspect of communication and language status is known to impact healthcare accessibility, its perceived suitability, and outcomes. However, its influence on treatment engagement and/or disengagement is unknown. Our study therefore sought to investigate the impact of language on service disengagement in an early intervention psychosis program in Montreal, Quebec (a province with French as the official language). We aimed to compare service disengagement between a linguistic minority group (i.e., English) vis-à-vis those whose preferred language was French and to explore the role of language in service engagement. Using a mixed methods sequential design, we tested preferred language and several sociodemographic characteristics associated with service disengagement in a time-to-event analysis with Cox proportional hazards regression models (