In this paper, the personality disorders most frequently related to alcoholism are described. A sample of 50 alcoholics seeking treatment, who were assessed with the IPDE in the course of the pre-treatment assessment, and 55 normal subjects from the general population with the same demographic features (age, sex and socioeconomic level) were selected. According to the results, 22% of the clinical sample (versus 7.27% of the normal sample) showed at least one personality disorder. The most prevalent disorder was the Avoidance Personality Disorder (32%), followed by the Non Specified (8%) the Borderline (6%) and the Antisocial together with the Narcissistic (2% each). The implications of this study for clinical practice and future research in this field, as well as the necessity to use diagnostic interviews instead of self-reports in the evaluation of personality disorders, are commented upon.