The objective of this paper is to examine the relationship between organizational citizenship behaviors (OCBs) and knowledge sharing. In this, the study proposes a model in which the five components of OCBs conducive to spontaneous behaviors are conducive to knowledge sharing As Wasko and Teigland claim that sharing may be attributed to a lack of OCBs, managers should first re-examine their corporate culture of OCBs, because a corporate culture encouraging employees to enhance the well-being, influence the knowledge sharing. The study was conducted on 181 part-time undergraduate students who work as full-time employees in a variety of industries during the daytime. The constructs in this study were measured using five-point Likert scales drawn and modified from the existing literature. Structural equation modeling (SEM) is used to explore the relationship between five components of organizational citizenship behavior and knowledge sharing. The test revealed that all the five components of OCBs are positively and significantly related to knowledge sharing. Lastly, the study includes discussion on implications and limitations of the study as the final section of this research.