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The aims of this study is to examine the effect of companies characteristics and good corporate governance on the quantity of environmental disclosure. The population of this study is companies listed on the Australian Securities Exchange (ASX) in year of 2017. This study using the top 100 companies on the ASX by the highest market capitalisation as a sample and all companies included and represented on the ASX 100 Index. The results showed that company size, industry type, board size, and gender had a significant positive effect on environmental disclosure, whereas company age did not affect the quantity of environmental disclosure. Based on the results of the study, it can be concluded that companies that fall into the category of sensitive industry disclose more environmental information than companies that fall into the category of non-sensitive industries. This finding can help regulators draft appropriate laws for the industry regarding specific environmental disclosure practices and conduct environmental performance assessments on companies, to assess the extent to which companies have been responsible for the environmental impacts caused by their operations.