This study aims to test and analyze company complexity moderates the relationship between good corporate governance and green intellectual capital with sustainability performance in industrial companies listed on the Indonesia Stock Exchange, for the period 2017 to 2021. This type of research is quantitative research using secondary data. The data analysis method is panel data regression test using Microsoft Excel and Eviews 9 applications. The population in this study is all industrial companies listed on the Indonesia Stock Exchange in the period 2017 to 2021. The data collection technique in this study was purposive sampling technique, with the results of 50 research populations in 30 research samples processed in this study. The results showed that company complexity moderates the relationship between good corporate governance and green intellectual capital, simultaneously with sustainability performance in industrial firms from 2017 to 2021. While partially, good corporate governance has a positive effect on sustainability performance, green intellectual capital has a positive effect on sustainability performance, company complexity strengthens the relationship between good corporate governance and sustainability performance, company complexity weakens the relationship between green intellectual capital and sustainability performance.