Proceedings of Annual Spain Business Research Conference 26 - 27 May 2016, Novotel Barcelona City Hotel, Barcelona, Spain, ISBN: 978-1-925488-05-0 The Mediating Role of Organizational Commitment in the Relationship between Job Satisfaction and Organizational Citizenship Behavior (A Study of Employees in State-owned Banking) ArifPartono Prasetio1, Tjutju Yuniarsih2 and Eeng Ahman2 The importance of Organizational Citizenship already well-known. OCB support the organization to achieve its goals. Organization need to develop its human resources in a way that can build the high level of citizenship behavior. Job satisfaction and organizational commitment can serve as an important factors for enhancing the OCB. The purpose of this study is to identify the mediating role of organizational commitment in the relationship between job satisfaction and OCB. The sample were derived from a survey using 39 items questionnaire distributed to the 320 employees of a state-owned banking in Bandung Area. All the respondents hold positions in marketing and small business market. The bootstrap confidence interval used to measure the mediation. The result revealed that there was a direct and indirect effect in the relation between job satisfaction and OCB. Since the interval did not contain zeroin the equation, then the research found these relations was mediated by organizational commitment. Organizational commitment indeed contribute as mediator in the effect of job satisfaction on OCB. Keywords: organizational commitment, job satisfaction, banking industry, organizational citizenship behavior JEL Classification: M540 ______________________________________________________________________________ 1 School of Economic & Business, Telkom University, Indonesia 2 Faculty of Economic and Business Education, Indonesia University of Education Partono67@gmail.com