This article includes a brief description of the different personality disorders following the classification of the DSM-IV-TR (APA, 2000) taking into account some disorders that have been included in Appendix B of this classification system or that were deleted from it but had been included in the DSM-III-R (APA, 1987). After defining personality and pointing out the basic aspects of that which could constitute a personality disorder, these pathologies are described paying attention to their clinical characteristics, their prevalence, gender differences, and some possible hypotheses on their ethiology. Finally, some brief reflections are presented by way of conclusion.