A demographic questionnaire and the Jamaica Personality Disorder Inventory (JPDI) were administered to a representative population sample consisting of 1506 Jamaicans, ages 18–64 years. Two-fifths of the population scored above the scale’s cut-point indicating a diagnosis of personality disorder with the level of severity ranging from mild to severe. This suggests a high risk of behavioural dysfunction in the Jamaican population, with significant implications in light of the country’s high rate of crime and violence.