Addressing stigma among primary care providers (PCPs) is critical for scaling mental healthcare and improving access to care. We conducted a multi-country, mixed-methods study to assess the feasibility, acceptability and pilot effectiveness of an intervention to reduce mental health stigma among PCPs. The intervention integrated PhotoVoice narratives from people with lived experience of mental health conditions (PWLEs) and aspirational figures in PCPs’ mental health training. It was implemented across seven sites in five countries. Mixed-methods data (qualitative interviews and quantitative measures on stigma knowledge, attitudes, intended behaviours and clinical competencies) were collected at baseline, immediately post-training and at the 3-month follow-up. The intervention was feasible across all sites, though PWLE recruitment and retention required contextual adaptation and logistical and psychosocial support. Acceptability of aspirational figures varied by setting. A descriptive trend suggested an increase in PCPs’ scores in stigma knowledge, attitudes and competency from pre- to post-training and remained elevated in the 3-month follow-up. PWLEs involved reported enhanced self-confidence, identity transformation and improved family relationships. Integrating lived experience photo-narratives into PCP training is feasible, acceptable and shows promise for reducing stigma and improving competency in diverse settings. Controlled trials are needed to assess effectiveness, cost-effectiveness and sustainability.