Background: Psychopathy and low self-control are useful constructs for understanding antisociality/criminality. The triarchic model of psychopathy in particular is a recent and promising conceptualisation, composed of boldness, disinhibition, and meanness -three personality traits that have never been studied in tandem with low self-control.Aims: To test relationships between the triarchic personality traits of boldness, disinhibition and meanness and low self-control with delinquent or antisocial acts.Methods: In a cross-sectional, self-report study a schools' cohort of 14-to 18-year-olds (Mean 15.91 years, SD = 0.99 years) was recruited from regions in South Portugal and Lisbon, representative of the general population of this age in sex distribution and education. After parental consent, teenage volunteers in small groups completed psychopathy and self-control self-rating scales and then a questionnaire about their criminal or delinquent activities, all on one single occasion and in confidence from school staff or parents.Path analysis was used to test relationships.Results: 567 young people, 256 (45%) of them girls, completed all ratings, 89% of those invited to do so. Low