Knowledge sharing is one of the most important practices of Knowledge Management (KM). Most studies focused on knowledge sharing in business organizations, but not many studies can be found on knowledge sharing in educational institutions. Researchers have not come to an agreement regarding the factors that affect knowledge sharing behavior. The purpose of this study is to review and integrate the literature to identify the factors that affect knowledge sharing behavior in educational institutions. A systematic literature review was conducted. Ten articles matched the inclusion criteria. The findings showed the majority of the articles were empirical and a total of 50% of the study was conducted in Malaysia. Academic staff was used by 90% of the study as target respondents. In addition, the findings showed that the factors that affect knowledge sharing are attitude, technology, rewards, culture, top management, and reputation. A propose model was developed and directions for future work are given.