This study was conducted to determine the effect of research and development intensity (RNDI) on firm performance (FP) with green product innovation (GPI) as an intervening variable. Companies which are always innovative with market developments will get two benefits. First, achieving competitive advantage. Second, obtaining economic benefits, therefore it will increase firm performance. This study uses 170 company observations from listed companies in Indonesia Stock Exchange at 2013-2017 as sample of research. The samples were choosen by purposive sampling method and were analized by path analysis method using STATA software. The result shows that RNDI has an effect on FP, RNDI has an effect on GPI, and GPI has an effect on FP. They indicate that GPI can mediate the effect of RNDI on FP in partial.