This paper, drawing on the author's own experience, explores the role of consultancy in developing groupwork programmes for adult male sex offenders. It reviews models of consultancy and considers their applicability to this particular area of work. It considers what knowledge and experience are relevant to this area of work. It addresses issues relating to values, knowledge, gender and race both in developing programmes and in selecting consultants. It considers how the focus and style of a consultancy can change during a period of work. Additionally, issues specifically related to groupwork with sex offenders and how it may affect workers are considered. In conclusion, the positive potential for this work is asserted.