This study examines and analyzes the influence of Sharia financial literacy, religiosity, and service quality on saving decisions in Islamic Banks with trust as an intervening variable in Jambi Province. This study has a sample size of 115 respondents representing each district/city in Jambi Province with a proportional nonrandom sampling technique. The data used were primary data obtained from distributing questionnaires. The research analysis method used Structural Equation Modeling Partial Least Squares (SEM-PLS) and data processing techniques using descriptive statistical analysis techniques and Partial Least Square (PLS) analysis with the help of SmartPLS 4.1.0.2 software. The results of this study indicate that Sharia financial literacy, religiosity, and service quality have a positive and significant effect on customer trust in Islamic banks in Jambi Province. Sharia financial literacy and service quality positively and significantly affect customer decisions to save at Islamic banks in Jambi Province. However, religiosity does not affect saving decisions at Islamic banks in Jambi province. Trust positively and significantly affects saving decisions at Islamic banks in Jambi Province. Trust can mediate the influence of Sharia financial literacy, religiosity, and service quality variables on saving decisions in Islamic Banks in Jambi province.