This study aims to examine the relationship among critical thinking, grit, and creativity, which will be core competencies in a future society, and to verify the moderating effect of grit as an individual psychological factor between the two variables. For this purpose, a Likert survey is conducted on undergraduate students in a Korean university; and 129 responses are used. The result shows that, first, critical thinking and grit have significant influences on creativity. Second, the moderating effect of grit on the relationship between critical thinking and creativity is significant. The finding indicates that the higher the grit, the higher the positive relationship between critical thinking and creativity. This result implies that to increase the creativity of college students, an education that increases both critical thinking and grit is necessary.