Abstract Islamic values as a social capital functions to build social integration. The research aims to find out why Islamic values is a social capital, and how social capital is useful to build harmony. The methodology used in this research was descriptive qualitative. The data were collected through interviews, observation, documentation and triangulation. Primary data were obtained from the government and community leaders as well as residents. The secondary data were obtained from documents and reference books. The qualitative data were analyzed interactively and continuously through data reduction, data presentation, and conclusions. The results of the research show that Islam religion has norms and values that are useful to form brotherly bonds, foster mutual trust and build social networks both vertically and horizontally, so that the goals of the individuals and groups can be achieved. Keywords: Islamic values, social capital, harmony, Mangir.