Background Despite global recommendations to prioritise policies that create healthy environments within education institutions, the implementation of effective healthy school food policies has proved challenging for many countries. This study examined the experience of Samoa in introducing a stronger policy to improve the healthiness of school food environments. Our aim was to identify opportunities to strengthen school food policy implementation in Samoa and other comparable contexts.Methods We used a qualitative case study approach, underpinned by policy science theory. We conducted in-depth semi-structured interviews with 30 informants, coupled with analysis of relevant documents, to generate a detailed understanding of the relevant policy implementation processes in Samoa, and the perspectives and capacities of key implementation actors. Data collection and analysis were guided by the Health Policy Analysis Triangle supplemented by other policy theories relevant to policy process.Results Samoaâs school food policy operationalizes international âbest practiceâ recommendations for school food policy, and provides insights into the outcomes resulting from high level political commitment. We found health policymakers and leaders in Samoa to be strongly committed to improving school food environments. Despite this, compliance to the school food policy had continued to face challenges. Key issues that negatively impacted on the policyâs effectiveness were the broader food environment in which schools were surrounded by unhealthy options, the lack of priority by stakeholders outside of health, and the high degree of agency exercised by actors in and around the school. We noted several opportunities for policies to be effectively implemented and sustained. Respondents identified community level leaders as potentially pivotal stakeholders, particularly in a context where school governance draws heavily on community representation.Conclusions The re-engagement of political and community leaders to identify the institutional and operational changes required, including a fully-enforceable accountability mechanism, may be needed to improve and embed effectiveness.