The present study aimed at investigating the effect of job and motivation on the knowledge sharing of librarians in public libraries. The present study was of survey type. The statistical population of this study was all librarians in public libraries of Iran and the sample included 245 subjects. Data collection tool was a questionnaire while the structured equation modeling and Lisrel software used for analyzing data. Based on research findings, this study highlighted the role of autonomy, feedback, and external motivation on the knowledge sharing behavior of the librarian. The findings of this study showed that autonomy had a mutual effect on the introjected and external motivation of librarians. Despite the lack of relationship between task identity and introjected motivation, the task identity has a direct and significant effect on their knowledge sharing behavior. In this study, the lack of relationship between feedback and external motivation of librarians was confirmed.

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