This study aimed to examine the role of lean marketing, through its key dimensions reducing non-value-adding activities, eliminating surplus or insufficient workforce capacity, simplifying complex activities, minimizing waiting times, reducing excessive communication costs, limiting trial-and-error practices, and reducing excessive core costs—in achieving service quality and enhancing customer satisfaction. To achieve the objectives of the study, a descriptive–analytical research approach was adopted. A structured questionnaire consisting of four sections was developed and distributed to a random sample of 200 consumers of telecommunications services in Baghdad. The collected data were analyzed using SPSS software, employing appropriate descriptive and analytical statistical techniques. The results of the study revealed the existence of a statistically significant correlation and impact between the seven dimensions of lean marketing, treated as independent variables, and both service quality and customer satisfaction, treated as dependent variables. These findings indicate that the adoption of lean marketing practices plays a vital role in improving service performance and strengthening customer satisfaction. The study recommended that telecommunications organizations should continuously identify and meet customer needs and expectations, provide clear and accurate information regarding services and their associated costs, and work toward the ongoing and precise improvement of service quality, ensuring alignment between actual service delivery and the promises made to customers.