Background: Transitioning from Child and Adolescent Mental Health Services (CAMHS) to Adult Mental Health Services (AMHS) raises novel ethical aspects for healthcare professionals, as well as for young people, their parents and carers. Method: Focus groups were conducted in Croatia, Ireland and the United Kingdom with youth mental health groups and youth representatives with no mental health (MH) remit. One hundred and eleven participants, aged from 16 to 60 years, contributed to discussions. Results: Perpetuation of stigma, autonomy and decision-making were central themes as both enablers and deterrents of successful transition. The tension between professional (and at times parental) paternalism and young persons' growing autonomy was well captured in the themes; (a) desired practice, (b) who should decide, (c) the process of decision-making and (d) potential harm(s). Conclusions: This study provides insight into the ethical values, particularly autonomy and collaboratively working, which people expect to underpin the transition between CAMHS and AMHS. Key Practitioner Message: Engaging young people early in making decisions about their future care can enhance trust between practitioner and the young person. In addition to diagnosis, a number of factors (such as moving home; waiting lists and stigma) may need to be taken into account when considering the direction of future health care. When possible, alternatives to AMHS should be considered if considered by the young person to be a less-stigmatising treatment option.</p