One of the important to consider in supporting successful learning is curiosity and creativity. The purpose of this study was to determine the effect of curiosity on mathematical creativity. This type of research is quantitative research. By using a random sampling technique, the sample of this research was 65 students in one semester of the mathematics education study program at the Islamic University of Malang. The data collected in this research is the result of a questionnaire about students' mathematical curiosity and creativity. The questionnaire in this study consisted of a questionnaire about curiosity and a questionnaire about mathematical creativity. The questionnaire used in this study has met the validity and reliability. The results of the questionnaire were analyzed by correlation test and linear regression test with the help of SPSS. The results showed that there was a correlation between curiosity and mathematical creativity. The results also show that curiosity has a positive effect on mathematical creativity by 43%. This influence is due to four things, namely curiosity about new information, alternative solutions, solutions to difficult questions, and errors in solving problems. Thus learning is expected to rise high curiosity, so that mathematical creativity increases.