The purpose of this study is to determine the influence of work climate, self-ability, organizational commitment, and organizational trust on the organizational citizenship behavior of outsourced personnel of the Yogyakarta Special Region PUP-ESDM Office; to determine the influence of work climate, self-ability, organizational commitment, and organizational trust on the organizational citizenship behavior of outsourced personnel of the Yogyakarta Special Region PUP-ESDM Office. The population taken in this study is all outsourcing personnel of the DIY Public Works, Housing and Mineral Resources Office. The sampling technique with saturated sampling method. Saturated sampling or census, is a sample determination technique in which all members of the population are used as research samples. In other words, all employees totaling 53 people are used as research respondents. The analysis tool used is multiple linear regression analysis. Based on the results of the analysis, it can be concluded that the work climate has a positive and significant effect on organizational citizenship behavior; self-ability has a positive and significant effect on organizational citizenship behavior; organizational commitment has a positive and significant effect on organizational citizenship behavior; organizational trust does not affect organizational citizenship behavior; work climate, self-ability, organizational commitment, and organizational trust simultaneously have a positive and significant effect on organizational citizenship behavior.