This study explains the influence of company size, profitability, environmental performance on firm value through Islamic Social Reporting (ISR) disclosure. The research is research explanatory which used secondary data listed companies at Jakarta Islamic Index (JII) by 2013 – 2017. The research results show that the size has positive effects not significant toward Islamic Social Reporting (ISR) disclosure. The size of the company also directly influence positively but not significantly to firm value, insignificant effect mediation through Islamic Social Reporting (ISR) disclosure. Profitability has a negative significant toward Islamic Social Reporting (ISR) disclosure and firm value positive insignificant effect mediation through Islamic Social Reporting (ISR) disclosure. Environmental performance has a positive significant impact on ISR disclosure and firm value but has no significant effect through ISR disclosure. This study also found that the influence of ISR disclosure has a positive insignificant effect on firm value