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The main aim of this study is to understand how buyer-supplier relationship and social capital influence green supply chain collaboration in manufacturing companies. Also, the mediating role of social capital between buyer-supplier relationship and green supply chain collaboration was examined. Because of that, a sample of 70 from logistic and middle levels' managers were chosen for distributing questionnaires. Collected data were analysed by partial least square method of structural equation modelling. The results indicated that there are positive relationships among buyer-supplier relationship (asset specificity, transaction frequency and competitive environment), social capital and green supply chain collaboration. Also, the mediating role of social capital are confirmed. But two hypotheses which are related to volume uncertainty are rejected. These findings provide considerable insights to managers and marketers of green supply chains that seek to respond to a growing interest of environmental performance of supply chain.