Interaction can be built by providing unique or different services to customer. Customer service that the company builds should be able to communicate with customers, so that the customers know about their whereabouts. With a good communication, the company might not only know what the customers needs are, but also get some feedback from the customer. Thus, the company must create quality service to survive from the competition against their competitor. The purpose of this research is to know whether service quality has an effect towards customer satisfaction at Belawan Indah Medan. The research designs used in this research are descriptive research design and correlational research design. Research methods used are descriptive statistical analysis, validity and reliability test, normality test, coefficient correlation, coefficient of determinant, simple linear regression analysis and Z testing. The population and sample are 72 people. The result of this research is that there is a positive effect between service quality and customer satisfaction at Belawan Indah Medan. From Z test, it can be found that Z count > Z table (4,247 > 1,96) so that Ho is rejected and Ha is accepted which means that the service quality has an effect on customer satisfaction at PT Belawan Indah In Medan. Based on the results of the Determination Coefficient test, it obtained the value of R square of 25.4% which means the magnitude of the influence of the service quality towards customer satisfaction that 25.4% while the remaining 74.6% is influenced by other variables. The magnitude of the correlation coefficient is 0.504 and it is positive. This value indicates positive and strong influences between the service quality and customer satisfaction. Based on the results of the study, it can be concluded that the service quality has a strong and significant effect on the positive direction of customer satisfaction. The implications of the results of this study which are expected is that company can increase service quality so that customer satisfaction can increase.