The objective of this study is to examine the effects of corporate governance mechanisms on Chief Executive Officer (CEO) Duality in the food industry of companies listed in the Tehran Stock Exchange (TSE).There are several aspects and dimensions of corporate governance, which may influence a CEO Duality but this study focused on three aspects namely Ownership Concentration (OWNCON); Institutional Ownership (INOWN) and Board's Independence (BOIN). This study utilizes a panel data analysis of 47 firms over a four-year period from years 2008 to 2011. In this study, log of total assets (SIZE) and total debt divided by total assets (LEV) are control variables. A logistic regression analysis is used to test the hypotheses. The results show has a positive and significant relationship between Ownership Concentration; Institutional Ownership; Board's Independence; Leverage and Chief Executive Officer Duality. Also, there is a negative and significant relationship between size and Chief Executive Officer Duality.