The purpose of this study was to determine the effect of product knowledge, product understanding level and religiosity awareness on interest in saving at BSI. The sample in the study obtained 126 respondents, namely FEBI students who have saved at BSI at least three transactions or who have used BSI products / services. The research method used is quantitative method using the IBM SPSS Statistic 25 application: Validity test, reliability test, normality test, multicollinearity test, heteroscedasticity test, multiple linear regression analysis test, t test, F test and determination test (𝑅2). The results of the t test showed that the product knowledge variable had a negative and insignificant effect on saving interest, the product understanding level variable had a positive and significant effect on saving interest, and religiosity awareness had a positive and significant effect on saving interest. The results of the F test show that the variables of product knowledge, product understanding level and religiosity awareness together have a positive and significant effect on saving interest.