Background Continuity of care (COC) is central to the organization and delivery of mental health services. Traditional definitions have excluded service users, and this lack of involvement has been linked to poor conceptual clarity surrounding the term. Consequently, very little is known about the differences and similarities in the conceptualization of COC by mental health service users and professionals. Objective To explore and compare mental health service users’ and professionals’ definitions of COC. Methods Using an exploratory, qualitative design, five focus groups with 32 service users each met twice. Data were analysed thematically to generate a service user‐defined model of COC. In a cross‐sectional survey, health and social care professionals (n = 184) defined COC; responses were analysed thematically. Service user and professional definitions were conceptually mapped and compared to identify similarities and differences. Results There was crossover between the service user and professional derived models of COC. Both contained temporal, quality, systemic, staff, hospital and needs‐related elements of COC. Service users prioritized access, information, peer support and avoiding services; health professionals most frequently referred to staff, cross‐sectional and temporal COC. Service users alone identified service avoidance, peer support and day centres as COC elements; professionals alone identified cross‐sectional working. Conclusions Important similarities and differences exist in service user and professional conceptualizations of COC. Further research is necessary to explore these differences, prior to integrating service user and professional perspectives in a validated COC framework which could enable the development and evaluation of interventions to improve COC, informing policy and practice.