This study examines the influence of Green Banking, Transparency, Sharia Compliance, and Service Quality on customer loyalty, both partially and simultaneously, at Bank Syariah Indonesia, Binjai Branch. The study population consisted of 36,193 account holders, from which 100 respondents were selected as the research sample using an appropriate sampling procedure. This research employed a quantitative approach, with primary data collected through questionnaires using a Likert scale. The collected data were subsequently processed and analyzed using IBM SPSS Statistics 25 to determine the relationship between the independent variables and customer loyalty. The findings indicate that Green Banking, Transparency, Sharia Compliance, and Service Quality collectively have a significant effect on customer loyalty at Bank Syariah Indonesia, Binjai Branch. These results suggest that the implementation of environmentally responsible banking practices, transparent information, compliance with Islamic principles, and quality services can contribute to strengthening customer loyalty. Therefore, improving these aspects simultaneously may support the bank in maintaining customer satisfaction, building trust, and fostering long-term relationships with its customers.
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