Background: In Pakistan, the prevalence of perinatal depression is high and is associated with adverse outcomes in both the mothers and their infant. Although effective psychosocial interventions have been developed for such settings, the scarcity of trained mental health professionals means that the majority of such women do not receive any intervention. The aim of this study was to explore the acceptability of peer volunteers (PVs) - volunteer lay women from the community with shared socio-demographic and life experiences with the target population - as delivery agents of a psychosocial intervention for perinatal depression in a rural area of Pakistan. Methods: This qualitative study was embedded in the pilot phase of a cluster randomised control trial. Participants included the entire sample of the pilot study: mothers (n=21), PVs (n=8), primary health care staff (n=5), husbands (n=5) and mothers-in-law (n=10). Data were collected, from these key stakeholders, through in-depth interviews and focus group discussions. Data analysis was underpinned by Framework Analysis involving five key stages: familiarisation, development of thematic framework, indexing, charting and interpretation. Results: All stakeholders viewed the PVs as acceptable delivery agents of a psychosocial intervention for perinatal depression. The PV's personal attributes such as being local, empathic, trustworthy, approachable and of good reputation within their communities contributed to their acceptability. Their linkage with the primary health care system was vital to their legitimacy and credibility. Factors such as appropriateness of the intervention, effective training and supervision, perception of personal gain from the programme, and endorsement from their families and the community were motivational for them. Likely barriers to their work were women's lack of autonomy, cultural beliefs around the perinatal period, stigma of depression, lack of some mothers' engagement and resistance from some families. Conclusion: PVs are a potential human resource for the delivery of a psychosocial intervention for perinatal depression in this rural area of Pakistan. The use of such delivery agents could be considered for other under-resourced settings globally, and for other mental health conditions.