During the last decade there has been an increasing interest in the role of impulsivity and aggressiveness in psychosocial disturbances. Despite scientific efforts, several aspects of the relationships between these personality features and Personality Disorders, alcohol/drug abuse, and violence are still controversial. A relevant question concerns the reciprocal relationships between impulsivity and aggressiveness, and their interaction with other “action” personality traits or temperamental traits, e.g., sensation seeking. Another controversial topic is the identification of biological and neuropsychological markers of impulsivity and aggressiveness in order to get more objective measures of these personality traits than those produced by subjects' self-reports, and to obtain a deeper understanding of the phenotypic aspects underlying impulsive and aggressive behaviours as manifested in different forms of psychosocial disturbances. Starting from these considerations, the aim is to shed some light on the implications and consequences of impulsivity for psychosocial disturbances, such as criminality, abuse, and violence. The issue will be discussed in terms of development, possible underlying factors, and attitudes, which can be particularly relevant from both forensic and prevention points of view.