Objectives: According to Social Cognitive Theory, the anticipated consequences of a behavior (outcome expectancies), coupled with our belief in our ability to successfully perform the behavior (self-efficacy), determine the likelihood of engagement in a behavior. We explored whether the relationship between nonsuicidal self-injury outcome expectancies and self-injury was moderated by self-efficacy to resist nonsuicidal self-injury. Participants: Five hundred and sixteen college students aged 18-26 years (M=20.60, SD=1.86). Methods: Self-report measures were completed online. Results: The relationship between expecting self-injury would result in pain or emotion regulation and engaging in self-injury was moderated by a belief in the ability to resist self-injury. People who had never self-injured were more likely to believe that self-injury would cause physical pain and believe they could resist self-injury. A belief in the ability to resist self-injury countered expectations that self-injury would result in emotion regulation. Conclusion: Results may inform college-based prevention and intervention efforts.