Green Intellectual Capital (GIC) refers to environmentally friendly management styles for gaining a competitive advantage. In this study, the impact of GIC was assessed on the project’s sustainability while big data was taken as a moderating variable. Data was collected from the manufacturing industry and analyzed using structural equation modeling. Results indicated that GIC has a significant effect on project sustainability. In the same way, big data moderates the relationship between the GIC and project sustainability, except for the relational capital construct. The finding of the study recommends that GIC, with the support of big data, can be helpful for the completion of sustainable manufacturing projects. Moreover, the study recommends that elements of the relational capital construct need to be explored in-depth to assess their role in project sustainability. In the same way, the GIC may also need to be tested and applied in other industries and countries for the delivery of value to customers.