Abstract: This research aims to test variables that are able to predict Organizational Citizenship Behavior using Social Exchange Theory. Social Exchange Theory is a very influential concept to comprehend employees’ behavior in their workplace. There are three variables assumed to become the predictor for extra behavior using social exchange theory concept, namely Perceived Organizational Support, Leader Member Exchange, dan Psychological Contract. There are390 manufacture employees in Yogyakarta used as respondents in this researh, using structutral equation model as the analysis tool. Variables in this research are measured using multidimensional measurement. The result of this research shows that those variables are predictor for Organizational Citizenship Behaviour.