The objectives of this study are to map and document the process of Psychological First Aid (PFA) implementation, review the methods employed, understand the role of PFA in the broader context of National Societies’ responses, and evaluate its potential sustainability and wider impact. By delving into the challenges, gaps, strengths, and lessons learned, this study seeks to provide valuable insights that can inform future Mental Health and Psychosocial Support (MHPSS) responses to emergencies.