This study aims to analyze the effect of knowledge, lifestyle and religiosity on people's interest in saving at Islamic banks in Jambi City. The population in this study is the people of Jambi City. The sample size in this study refers to the theory proposed by (Hair et al., 2017) which recommends a minimum sample size of 5 times the number of question items, so that a sample of 90 is obtained. Quantitative analysis method using multiple linear regression equation analysis, continued with analysis of determination (R Square), partial hypothesis testing (t test) and simultaneously (F test) with an alpha of 5 percent (0.05). Prior to further analysis, the classical assumption test was carried out first. The analysis tool uses SPSS version 23.0 for windows. The results showed that knowledge, lifestyle and religiosity had a positive and significant effect on people's interest in saving at Islamic banks in Jambi City.