The involvement of service users in the research process is becomingly increasingly required by many funders of research and is being seen as an indicator of quality in its own right. This paper provides original data from a study of social policy researchers’ views of service user involvement in research. It shows a diversity of stances which have been categorised here as belonging to Advocates, Agnostics and Adversaries of user involvement. The views of Agnostics and Adversaries pose serious challenges that need to be addressed if service user involvement is to be more widely accepted and valued by some researchers and academics in social policy.