Social disorganization theory explains the effects of neighborhood structure and culture on crime and delinquency. Within this perspective, the role of neighborhood informal social control is argued to be an important protective factor against many social problems. While a growing body of research supports the importance of informal social control, we still have limited understanding of its development. Of the research that does exist in this area, most examines structural processes supporting informal social control, while cultural aspects of communities have only rarely been examined. The authors further develop this limited body of research by drawing on the prevention literature that focuses on social norms and their misperceptions. Specifically, this study examines the role of pluralistic ignorance regarding neighborhood values on the likelihood of informal social control. The results are discussed in relation to social norms theory and their relevance for crime-prevention strategies. (Published Abstract)