This paper focuses attention on the ethical issues concerning the involvement of young service users as co-researchers. In particular the article offers an examination of the limitations of the term ?service user?, comments on degrees of participation and explores the ethical issues prior to the start of the research, during the research and after the research has been completed. Particular emphasis is focused on the topics of: the funders of research, ethics committees, valuing contributions, informed consent, confidentiality, authorship and ending (...) the research. The article also suggests that this is a complex area worthy of further exploration and that many of the ethical challenges identified for working with young service users also need to be considered for young service user co-researchers. (shrink)