Nowadays, knowledge sharing has become the source for pursuing and maintaining competitive advantage. In order to achieve such advantages, organizations need to identify individuals and organizational factors influencing knowledge sharing. This study mainly aims to investigate the relationship between affective commitment and knowledge sharing, with regard to affective trust and cost of knowledge sharing. For this purpose, 185 questionnaires, each containing 30 questions, was dispensed among employees of Khorasan science and Technology Park. Pearson’s correlation coefficient was applied to test the first and third hypotheses and regression analysis for the second one. The results suggested a direct and positive relationship between affective commitment and knowledge sharing behavior, but the impact of affective trust as the moderator variable and cost of knowledge sharing as the mediator between affective commitment and knowledge sharing was not confirmed. On the other hand, research data supports a direct and negative relationship between the cost of knowledge sharing and knowledge sharing behavior, which is moderated through affective trust.

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