Plain English summary Within health services research in the UK, there has been growing interest in evidence-based medicine (EBM) and patient and public involvement (PPI) in research. These two movements have a common goal of improving the quality and transparency of clinical decision making. So far, there has been relatively little discussion about how these two movements might relate to each other, despite their common concern. Indeed, some in the PPI movement have expressed doubts about the implications of EBM for PPI because they worry that its emphasis on evidence from clinical trials marginalises the importance of a patient’s individual experiences in clinical decision making. The purpose of this paper is to examine the potential for EBM and PPI to complement one another. We analysed the feedback of 10 members of the Peninsula Public Involvement Group (PenPIG) who attended EBM workshops. These workshops trained people in the basics of EBM and were primarily attended by health professionals. We used thematic analysis, a qualitative data analysis method, to explore the responses. We found that participation in the workshops appears to have increased the ability and confidence of members of the public to actively participate as both producers and consumers of research evidence. We conclude that there is an untapped potential for EBM and PPI to complement one another in their shared desire to improve the quality and transparency of clinical decision making. Abstract Background Within the UK, health services research in the 1990s was marked by growing interest in evidence-based medicine (EBM) and in the potential of patient and public involvement (PPI) in research. However, there has been relatively little discussion of how these two developments might relate to each other, despite their common concern to improve the quality and transparency of clinical decision making. Indeed, some in the user involvement movement have expressed doubts about the implications of EBM for PPI. The purpose of this paper is to examine the potential for EBM and PPI to complement one another. Methods We used a case study design. Fifteen EBM workshops, involving PPI members, were conducted between June 2010 and December 2014. All 13 lay participants, who attended the first five workshops, were asked to fill in a standard feedback proforma designed by a member of the NIHR Collaboration for Leadership in Applied Health Research and Care for the South West Peninsula (PenCLAHRC) Public Involvement Group (PenPIG). Ten responses were received, and these were analysed thematically. Results Four themes emerged from the thematic analysis: research knowledge, research skills, shared clinical decision making and .