Social capital is a concept whose popularity in social sciences is rapidly growing and the range of its application is also on the increase to the extent that some social scientists consider it to be panacea that can cure almost all of the problems of the modern society. Research in this area also shows that it can indeed have positive effects and ramifications in dealing with many of the difficulties that contemporary societies face. Like other capitals, social capital is productive and can lay the grounds for making benefits from economic and cultural capitals already existing in the society. This study aims to look at the effects of different kinds of capital (economic, social, and cultural) on the quality of life of Tehrani residents. Research method is survey and a questionnaire was used to collect the needed data. A sample of 400 residents provided the information. Research results showed that all components of social capital, namely social trust, social participation, social awareness, social networks, were positively related to quality of life. The overall correlation coefficient between social capital and quality of life was 0.53, meaning that about 28 percent of the variance of quality of life is determined by social capital. Of the different components of social capital, social trust had the most influence with a correlation coefficient of 0.546 and a coefficient of determination of 0.298.