The growing incidence of mental health problems in adolescents is a significant global concern. School-based counselling, where a student meets with an individual, trained counsellor a number of times in a school setting, is a common component of holistic mental health programmes to support the well-being of students. In Hong Kong, however, professional counselling is in general not well-developed, and school-based counselling has been severely under-researched. Drawing on data from interviews with 8 counsellors and 25 student clients in local secondary schools, the present study aims to investigate the perspectives of counsellors and clients on the practice of school-based counselling in Hong Kong. Following a thematic approach, the study compares the key themes identified in the reflections of counsellors and clients on their experience of counselling. Similarities and differences in the discursive construction and realisation of themes are examined in detail. Representative examples are discussed in context to illustrate the views from both the service providers and users of school-based counselling. Findings from this study will inform and enhance understanding of how school-based counselling can help to promote the mental well-being of students in the local educational setting and in the broader Asian context. Copyright © 2020 Springer Nature Singapore Pte Ltd.