Objective: The main purpose of this research is to evaluate the Libraries of Tehran Province Oil Industry according to Iranian Special Libraries Standards. There are 8 main Factors: Objects & Duties, Organization & management, Employees, Acquisition, Classification, Services to clients, Building & equipments, Budget to evaluate these libraries.Methodology: The survey and comparative method has been used for this research. For gathering the information a questionnaire was designed which was based on the Iranian Special Libraries Standards. The statistical sample of this study is 21 libraries of Tehran Province Oil Industry.Findings: For evaluating Libraries of Tehran Province Oil Industry according to Iranian Special Libraries Standards, 113 factors were considered. The information of Objects & Duties, Organization & management, Employees, Acquisition, Classification, Services to clients, Building & equipments and Budget of the studied libraries were provided. The results of the research show that in 95, 62, 81, 100, 76, 67, 57, and 52 percent of studied libraries.Conclusion: The standards regularly have been considered and the hypothesis of the research confirmed. Finally some suggestions are proposed for improvement.