This study explores the impact of organizational culture on enhancing the competitive advantage of the Yemeni-Omani United Telecommunications Company (YOU). It focuses on the relationship between organizational values, beliefs, and expectations, and how they contribute to the company's competitive performance. The researcher used a descriptive analytical methodology to analyze surveys collected from 139 employees of the company, relying on descriptive statistical measures such as mean and standard deviation, and simple regression analysis to measure the effects. The results show that improving organizational culture by one unit enhances competitive advantage by 0.808 units. The data indicate that 57.8% of the company's competitive success can be explained through organizational culture assessments. Furthermore, the results demonstrate high evaluations of organizational culture, with an average of 3.64 and a relative importance of 72.8%. Organizational values rank highest with an average of 3.77 and a relative importance of 75.4%, followed by organizational expectations with an average of 3.69 and a relative importance of 73.8%, while organizational beliefs are ranked last with an average of 3.45 and a relative importance of 69.0%. Additionally, the study reveals a statistically significant positive relationship between the dimensions of organizational culture and competitive advantage, indicating the importance of enhancing values, beliefs, and expectations to achieve sustainable competitive success.