The competition among last mile delivery companies such JNE in Indonesia is intense, and companies must be able to offer fast and reliable delivery services, competitive pricing, and excellent customer service to stay ahead of their competitors. Those that can successfully differentiate themselves from their competitors and provide value to their customers are likely to be the most successful in this highly competitive industry. The purpose of this study was to investigate the effect of promotion and service quality on customer satisfaction of using JNE service. The study collected data from a sample of customers who had used JNE service in the past three months. The data was analyzed using regression analysis to test the hypotheses that promotion and service quality have a positive effect on customer satisfaction. The results of the study showed that both promotion and service quality have a significant positive effect on customer satisfaction. These findings have important managerial implications for JNE service.