Information technology (IT) in general and Internet in particular has revolutionized our lives in so many ways. Business sectors as well as many others are taking advantage from Internet and other IT systems in the world. The concept of Electronic Commerce (E-Commerce) is the process of buying and selling products and services using electronic systems such as Internet. E-Commerce has been well adopted in the developed countries and is considered as a major source in improving the revenue in those countries. Meanwhile developing countries are lagging behind developed countries due to many inhibitors which hinder the process of E-Commerce adoption and implementation. This MBA thesis is a research on the status of the E-Commerce in the Iranian oil industry and the factors influencing it’s adoption through the analysis and assessment of the data received from the respondent companies. A study based on the E-Commerce adoption model presented by Elahi S. with 156 questions (grouped into 14 questionnaires) was designed and sent out to 50 companies. The analysis of responds based on the Elahi model suggests that there is a strong positive relationship between the study conducted by Elahi and the one conducted by this research work. In another word, it proves that the indicators of model presented by Elahi are valid factors for the E-Commerce adoption in the Iranian oil industry. The responds from the customer-based model presented by Wei J. would identify the status of E-Commerce in the Iranian oil industry, the obstacles on it’s way and the ways to improve it.