This study aims to analyze the factors that influence the low interest of the community using Islamic financial institutions in Grobogan Regency, Central Java. These factors are service, knowledge and religiosity. This study uses primary data by providing a questionnaire to the Muslim community in Grobogan Regency who do not save in Islamic banks and do not conduct transactions in other Islamic financial institutions, with a total sample of 100 respondents. The method used in this study is Multiple Linear Regression. By using SPSS 19.0 data processing program. Based on the analysis that has been carried out, the results show that service variables have a positive and significant effect on people's interest in using Islamic financial institutions, because the better the service will increase the interest of the community, and vice versa. knowledge has a significant positive effect on interest in using Islamic financial institutions because the more knowledge will increase the interest in using Islamic financial institutions, and vice versa. And for religiosity has a positive and insignificant effect on the interests of the Grobogan community using Islamic financial institutions, because not all individuals who have high religiosity will choose Islamic financial institutions as a place to conduct transactions.