The purpose of this study is to investigate the relationship between green intellectual capital and firms’ competitive advantage in Malaysia. More specifically this study examines the impact of four dimensions of green intellectual capital; green human capital, green innovation capital, green organisational capital and green relational capital on firms’ competitive advantage. Using survey as a method to collect data from 224 managers of manufacturing firms in Malaysia, the result shows that green intellectual capital and its dimensions, specifically the green innovation capital, green organizational capital and green relational capital have significant and positive relationship with firms’ competitive advantage. Overall, the findings highlight the importance of green intellectual capital as a valuable business resource which in turn enhances firm performance and competitiveness.