One of the objectives of financial reporting is preparation and delivery of information to provide the basis for investors and creditors to make decision. In this regard information should be useful, relevant and has the ability to influence economic decisions and leads to the best decision. On the other hand financial information should be disclosed appropriately to be useful in decision making and access to this information should be possible for everyone. The main objective of this research is to study the factors affecting the level of information disclosure of listed companies in Tehran Stock Exchange. This is an applied research and the method of data collection is descriptive. The sample of the study is all companies listed on the Tehran Stock Exchange. 82 companies during 2009_2014 were selected to test the hypotheses of the study. To evaluate the effect of independent variables on the dependent variables six hypotheses were tested. To analyze the results Eviews 7 software was used. The effect of the independent variable on the dependent variables in this study was based on the combined data and using multivariate regression. The results showed that there is a significant relationship between assets, sales, financial leverage, profitability, and liquidity with information disclosure level of listed companies in Tehran Stock Exchange.