Purpose- This study aims to examine the impact of Green Intellectual Capital on Business sustainability through mediating Green Innovation in Egyptian industrial companies. Design/methodology/approach – Data were collected from 269 employees working at industrial companies in Damietta Port and the industrial zone at New Damietta. PLS-SEM method was used to examine the mediating role of Green Innovation in the relationship between Green Intellectual Capital and Business Sustainability. Findings – The main finding of the study is the level of Green Innovation increased significantly when manufacturing companies invest more in Green intellectual Capital and then green innovation has a significant effect on business sustainability. Furthermore, green intellectual capital has a direct effect on business sustainability. In addition, Green Innovation partially mediates the relationship between Green Intellectual Capital and Business Sustainability. Originality/value – The novelty of this study is the contribution of green intellectual capital in achieving business sustainability. In the light of results and to cope with the rising green concerns of the manufacturing companies especially in Egypt, many recommendations were suggested to maximize the impact of Green Intellectual Capital on Business Sustainability. .