Introduction: In the hospital’s environment, conflict is unavoidable due to differences in gender, educations, and Career goals, frequent and complex interactions between their personnels. Both of two extremely level of conflict (minimum & maximum) are preventing desired performance. Appropriate level of conflict should avoid recession, encourage creativity and reduce stress. The present research aims to determine the amount of conflict in Tehran University of Medical Science’s hospitals. (TUMS).

Method: This study is descriptive - analytic. The study population consists of 706 managers (senior, intermediate, basic) from 14 hospitals affiliated with TUMS. Data was collected by a self-made questionnaire and was analyzed with SPSS software.

Results: The level of conflict in Tehran University of Medical Science’s hospitals was average. 84% of total conflict was caused by organizational factors. There were a significant association between conflict and level of management, educations, work experience, type of unit, bed numbers, the number of employee under supervision, conflict management training course

Conclusion: Hospital managers should change their organizational cultures and revise some structural variables such as goals, procedures…  In order to maintain the optimal level of conflict.

Keywords: Conflict, a mount of Conflict, Managers, Hospital.