The purpose of this study was to examine the effects of supervisor leadership on trust and organizational commitment. Three hundred questionnaires were distributed to the employees of twelve deluxe hotels in Jeju from December 29, 2008 to January 9, 2009. Of those, 271 were collected. The questionnaires consisted of transactional and transformation leadership, trust, and organizational commitment questions. These questionnaires were analyzed by SPSS 12.0, and frequency, reliability, factor, and regression analyses were conducted. The results of the empirical analyses are summarized as follows: transactional and transformation leadership had positive effects on trust and organizational commitment. Trust had also a positive effect on organizational commitment. Therefore, through various training and communication methods, hotel managers have to form a system and procedure that can be shared by all of the members of an organization.