Gambling behavior is a prevalent problem requiring the development of effective behavioral interventions targeting reductions in the behavior. Many theories of social cognition can be adopted to identify the specific psychological mechanisms interventions should target and how interventions can be designed to manipulate them. The purpose of the paper is to demonstrate how the Reasoned Action Approach can be used to achieve these aims. The paper outlines the steps involved in identifying relevant psychological determinants for intervention when adopting the theory. Behavior change is then discussed and the importance of translating intentions and maintaining change is emphasized. It is hoped that the paper encourages the development of a greater number of theory-based interventions targeting reductions in gambling behavior. Doing so may lead to a reduction in the number of people participating in the behavior.