The research aimed to study the economic structure of olive production in the mills of the private sector in North Sinai Governorate, where in this activity is considered one of the important and widespread activities in the governorate. The results related to the indicators of the financial evaluation of the private sector mills showed that, in light of the current conditions, the internal rate of return averaged about 63.4% for large private mills, compared to about 45.2% for small-capacity mills. The results indicated that in light of the risks that the private sector mills may be exposed to, represented by a 10% increase in costs, the average internal rate of return for the year reached about 48.2% for large-scale private mills, compared to about 36.4% for small-sized mills. the results also showed that in light of a 10% decrease in revenues, the internal rate of return for large capacity presses amounted to about 46.8%, compared to about 35.6% for small capacity presses, during the 2021 manufacturing season. Undoubtedly, the obtained indicators of the internal rate of return confirm the feasibility of investing in the processing of olive fruits in large capacity private mills, as they emphasized the achievement of high internal rates of return by large mills. the research recommends the need to work on modernizing and maintaining oil mills by maintaining and working to reduce impurities as much as possible without using any heat, as it was noted that most societies inside and outside Egypt need virgin oil.