In the phase of global business scenario, Organizational Citizenship Behavior(OCB) has received a great deal of attention among researchers given the practical importance and its implication for the organization. The main objective of this study is to examine the effect of Organizational Commitment on Organizational Citizenship Behavior. Data was collected through the administration of questionnaire to 60 employees of an IT company. The respondents completed the questionnaire which assessed the Affective Commitment, Continuance Commitment, Normative Commitment and Organizational Citizenship Behavior. The respondents were selected based on the purposive sampling. The result of the data is interpreted by using Statistical Package for Social Sciences (SPSS). In order to analyze the data, regression analysis was employed. The results of the research found that Affective Commitment and Normative Commitment have a significant impact on Organizational Citizenship Behavior, while Continuance Commitment has no significant impact on Organizational Citizenship Behavior. This study provides inputs on different types of organizational commitment and their differential effect on Organizational Citizenship Behavior.