BMT is currently experiencing very rapid progress, as evidenced by the increasing number of financial institutions scattered everywhere. Of course, this is a challenge for sharia-based financial institutions, especially KSPPS BMT NITEN. The number of competitors makes it difficult for companies to retain members to remain loyal. To retain members, companies must provide good service quality and implement relationship marketing strategies to achieve member satisfaction, which will form member loyalty. This study aims to examine the effect of service quality and relationship marketing on member loyalty with member satisfaction as an intervening variable (study at KSPPS BMT NITEN). Data was collected by distributing questionnaires to 100 respondents with direct survey techniques. This quantitative research method uses data analysis techniques using Structural Equation Modelling (SEM) through the SMART PLS 4.0 software. The results showed that service quality and relationship marketing affect member satisfaction and loyalty, both directly and indirectly mediated by member satisfaction. Keywords: Financial institutions, Service Quality, Relationship Marketing, Customer Loyalty