Violent behavior presents many social, legal, and clinical problems. A number of models have been developed to explain violence, representing a variety academic disciplines and theoretical orientations. Unfortunately none of these approaches have led to a comprehensive understanding of violence and aggression. The issue of violence is particularly perplexing in connection with the role of psychiatric disorders as contributing factors. Several psychiatric conditions, including bipolar disorder, have been implicated with increased rates of violent behavior. This paper examines various models of violence, influences on violent behavior, and violence associated with psychiatric disorders. Particular attention is devoted to the connection between bipolar disorder and violence.