Environmental issues disclosure and stock price volatilityhave featured prominently in the global debate on the financial market. Studies have shown that investors are agitated about stock price volatility due to non-disclosure of some vital environmental issues. Studies abound, especially in the created nations, on the impact of environmental issues disclosure onstock price volatility.This study investigated the effect of environmental issues disclosure on stock price volatility in Nigerian financial market. The study adopted survey research design by administering six hundred copies of structured questionnaire to the staff of eleven selected banks out of the twenty-one Money Deposit Banks in Nigeria as at 31/12/17, using event criterion based on those banks with complete information and continually listed during the period of the study 2008-2017. The regression analysis was adopted in testing the hypothesis formulated. The findings revealed that environmental issues disclosure had significant positive effects onStock Price Volatility (SPV) (Adj. R2 = .114,F (4, 476) =16.47,p<0.05)in the Nigerian financial market. The study concluded that disclosure of environmental issues influenced Stock Price Volatility in the Nigerian financial market. The study therefore, recommended that non-financial information should be captured in the financial statements to engender investors’ confidence in the Nigerian financial market.