WHAT IS KNOWN ON THE SUBJECT: The introduction of PSWs within mental health services has grown substantially both internationally and locally; however, no recognized studies have focused on the evolvement of this role within a Northern Ireland (NI) context. Research is increasingly focusing on service users' and PSWs perspectives on mental health service provision. Despite this, few studies exist which exclusively report staff views in relation to the PSW role. WHAT THE PAPER ADDS TO EXISTING KNOWLEDGE: Results of the current study identified varying perspectives on the peer role. Some participants believed that the PSW role was tokenistic; others opposed these views, highlighting the value of this role. Clearly defined job descriptions and the importance of ensuring the PSW is a cohesive part of the team and not an "add on," was identified as imperative to avoid tokenistic practice. Provision of a flexible working environment, both sensitive and responsive to the peers' own mental health needs, was identified as significant in order for the peer to fulfil their role successfully. IMPLICATIONS FOR PRACTICE: Services introducing PSWs within teams should engage with nursing staff at all organizational levels in the role development process to minimize the risk of tokenism, for example, the PSW role not integrated or valued within teams. Clearly defined job/role specifications for PSWs should be devised to ensure that both the PSW and the mental health nursing team have a shared understanding regarding this role. ABSTRACT: Aim Peer support worker (PSW) roles are gaining recognition internationally as a valuable component in mental health service delivery. The aim of this study was to explore the views of mental health voluntary sector staff regarding the emergence of this role. Method A qualitative research design was used. A purposive sample was employed. Semi-structured interviews were undertaken with 10 staff members in various positions in two voluntary mental health organizations. Interview transcripts were analysed thematically. Results Views varied on the PSW role with some participants stating that it was tokenistic, whereas others highlighted the value of its contribution. Participants' expressed concerns regarding professional boundaries and organizational cultural challenges that PSWs may encounter in their role. The provision of reasonable adjustments was recommended as an integral support mechanism. Conclusion Successful integration of the PSW requires careful consideration of the role, the workplace environment and the unique needs of the peer, to prevent the role becoming constrained and diluted. Implications for practice The PSW role may impact the traditional delivery of mental health nursing services. It is therefore essential that nurses are cognizant of these potential challenges to successfully facilitate the integration of PSWs in practice.