Management earnings forecast is one of the most important sources of information for investors and other people. On the other hand, corporate governance is one factor that is expected to affect the quality improvement of information disclosed by companies. The purpose of this research is to examine the relationship between corporate governance mechanisms (i.e. the percentage of the outside member of the board of directors, CEO duality, institutional ownership and auditing quality) and earnings forecast accuracy. The research sample is 96 Companies listed in Tehran Stock Exchange for the period of 1384 -1389. The multivariable regression model for pooled data used to test the research hypotheses. The findings indicate that there is a positive significant relationship between the percentage of the outside member of the board of directors and earnings forecast accuracy. The findings indicate no significant relationship between other corporate governance mechanisms including CEO duality, institutional ownership and auditing quality and earnings forecast accuracy.