This study examined the effects of creativity training on creative self-efficacy. We developed a creativity course based on social cognitive theory. The course was conducted in two formats: a five-day course and a condensed one-day course. Samples consisted of students and municipality employees (five-day course), and special education teachers (one-day course). Students from a mathematics and statistics course constituted a control group. We measured creative self-efficacy before and after the intervention, and self-efficacy improved significantly for both the five-day and the one-day courses, while the control group showed no changes in creative self-efficacy. Self-efficacy levels increased significantly for both students and municipality employees. A follow-up assessment two months after completing the five-day course showed no decline in creative self-efficacy. (Contains 3 figures and 2 tables.)