In today's societies where relationships are extremely fragile among individuals and groups, trust, which is posited as a central issue in the organization, can contribute to the growth and sustainability of these relationships. On the other hand, paying attention to the welfare of employees increases the level of perceived vitality among them, which makes it profitable. The main purpose of this research is to investigate the effect of organizational trust on productivity with the role of mediator of vitality. The present research is a descriptive-correlation one in terms of applied purpose and in terms of collecting data. To do this, a sample of 225 people from the 540 population community was selected according to Cochran's formula among employees of Ilam University based on random sampling method. The research tool is a questionnaire. Validity of the questionnaires was confirmed through content validity and their reliability was measured by Cronbach's alpha and 0.97, 0.98, 0.96, respectively. To analyze the collected data, in the first stage, using the Pearson Correlation test, the relationship between each of the predictor variables was evaluated separately with the criterion variable, and in the second stage, to determine the contribution of each of the variables before Based on the criterion variable, multivariate regression analysis was used. The results showed that organizational trust affects productivity. Also, vitality can have a mediator role in this regard. Trust and confidence facilitate friendly communication and transfer of knowledge to other employees, which increases productivity in the organization.