Cost stickiness has received much attention in the accounting literature. Prior studies have predominantly explained cost stickiness with economic factors, but they ignored the impact of corporate governance on cost behavior. This study aims to investigate the role of corporate governance mechanisms on sticky cost behavior of Iranian companies by using the panel data approach. The sample is comprised of 212 companies listed in Tehran Stock Exchange (TSE) during the period of 2007-2012. This is a fundamental research according to the purpose, and a correlation (non experimental) research according to the data gathering approach. After controlling for firm-specific variables, the results imply a positive relationship between corporate governance and the degree of cost stickiness. The overall evidence suggests that the corporate governance provides an important explanation for asymmetry behavior of costs. Furthermore, the results demonstrate that disaggregating corporate governance measure into more components cause to decreasing in explanatory power of the models and make them insignificant.