This study aims to analyze the effect of service quality and trust in J & T Express shipping services on customer loyalty with customer satisfaction as a mediating variable. the subjects in this study were the people of Yogyakarta city who had used J & T Express shipping services at least twice in 6 months. This research was conducted with a total sample of 119 respondents. The sampling technique uses a nonprobability sampling type with a purposive sampling method. The analysis technique used in this study is Structural Equation Modeling (SEM). The results of this study indicate that service quality has a positive and significant effect on customer satisfaction, trust has a positive and significant effect on customer satisfaction, service quality has a positive and significant effect on customer loyalty, trust has a positive and significant effect on customer loyalty, customer satisfaction has a positive and significant effect on customer loyalty, service quality has an effect on customer loyalty through customer satisfaction as a mediating variable, customer satisfaction is unable to influence the effect of trust in customer loyalty.