Researchers have long known that self-control, or impulse control, is important for a variety of life outcomes, including health, education, and behavior. In criminology, the most popular perspective on self-control argues that it is a multidimensional trait that is relatively stable after about age 8. Some work, however, has shown that in fact, self-control may not be as stable as originally thought. This article examines the evidence on interventions seeking to enhance self-control and subsequently to reduce delinquent or criminal behavior. The evidence is growing but still in need of development. Implications for future research and practice are discussed in the conclusion.