The purpose of this study was to provide a better understanding of the link between selforiented perfectionism and academic procrastination by examining the role of self-efficacy as a mediator in the relationship. We explored the preliminary model and the competitive model. To examine these two models, we collected the survey results of 692 college students and employed structural equation modeling. The results of this study showed that students with high self-oriented perfectionism procrastinated less than others. It was also found that self-efficacy fully, rather than partially, mediated the relationship between self-oriented perfectionism and academic procrastination. Implications of this study are discussed.