AbstractAimThis scoping review aimed to identify and appraise the effectiveness and impact of breastfeeding promotion interventions conducted across Portuguese‐speaking sovereign countries.MethodsUsing the PRISMA‐ScR guidelines, we searched 14 electronic databases for publications published through 31 July 2023. The search terms were designed to find studies promoting breastfeeding or exclusive breastfeeding in pre‐defined Portuguese‐speaking countries.ResultsOf the 5263 papers initially retrieved, 30 interventional studies on breastfeeding met the inclusion criteria across three countries: Brazil (N = 26), Portugal (N = 2) and Guinea Bissau (N = 2). Participants ranged from pregnant women, mothers, mother–infant pairs, healthcare professionals, and school children. Overall, the interventions increased exclusive breastfeeding and better breastfeeding practices, such as a higher duration of breastfeeding. The interventions positively affected maternal breastfeeding self‐efficacy, knowledge and perception. Only four studies used a theoretical framework.ConclusionWhile the results were often statistically significant, no study had an outcome close to the recommended UNICEF and WHO goal of 70% breastfeeding at six months. The need to determine what works for the recommended six months postpartum period is critical for maximising children's health in Portuguese‐speaking countries.