The purpose of this study is to investigate the impact of psychological contract and perceived supervisor support on organizational citizenship behavior of hospitality employees in South Korea. 350 employees working in international hotel chains in South Korea were sampled and 257 of them completed the survey. The results of the study showed that same as in western countries, when hospitality employees in South Korea perceive greater supervisor support, they would demonstrate more organizational citizenship behavior. However, different from western countries is that neither transactional psychological contract nor relational contract has impact on organizational citizenship behavior of hospitality employees in South Korea.