The quality of mobile banking in the banking world is highly prioritized and considered in current customer service, and good relationship marketing is expected to make Islamic banking customers loyal. Looking at today's digital era, it is hoped that this research aims to determine the effect of the quality of mobile banking and relationship marketing on customer loyalty. This study uses a quantitative approach by distributing questionnaires so that primary data is obtained which is processed. the research results show that the quality of mobile banking has a significant effect on the quality of mobile banking, and relationship marketing also has an effect on customer loyalty. However, location has no significant effect on customer loyalty.