Abstract
This study examines the effect of environmental accounting disclosure on the financial
performance of listed oil and gas companies in Nigeria over the period 2016–2020. Using an ex
post facto research design, the study relies on secondary data obtained from the annual reports
and financial statements of five selected firms. Environmental accounting disclosure was
measured through a disclosure index constructed using content analysis, while financial
performance was proxied by return on assets, profit after tax, and total assets. Panel data
regression techniques were employed, including fixed and random effects models, with the
Hausman test used to select the most appropriate estimator. The results show that environmental
accounting disclosure has a negative and significant effect on return on assets, indicating short
term efficiency pressures associated with environmental compliance costs. However, the findings
also reveal a positive and significant relationship between environmental disclosure and both
profit after tax and total assets, suggesting long-term profitability and asset growth benefits. The
study concludes that environmental accounting disclosure supports long-term financial
sustainability despite short-term efficiency trade-offs.