In 2009, the newly elected FMLN government of El Salvador launched a comprehensive health reform, which gave the National Health Forum (NHF) a key role in developing community participation. This study aims to examine and analyze the content and impact of this social movement during the study period 2009-2018. The context was analyzed through relevant documents, which helped identify key stakeholders. Semi-structured interviews took place at 3 levels of decision making: the political level, the health professionals, and the community. Data were analyzed using a qualitative methodology. Participation is carried by a structure created by the Ministry of Health, the National Health Forum. The NHF developed 3 strategies: (1) leadership building in the communities through the strengthening of social, political, and economic skills, where they developed social accountability mechanisms at all decision-making levels of the health system; (2) the strategy carried by the sectoral working groups, where they responded to prioritized needs identified by the community; and (3) advocacy for human rights-based policies. The NHF, and its role in the strengthening of the National Public Health System, provides strong evidence of community participation strategies and co-governance with the health system within the social determinants of health scope.