This chapter covers the role and relevance of personality disorder (PD) in general, and psychopathy in particular, for sexual offending behavior. It begins with a review of the clinical and etiologic relevance of PD in sexual offending, including base rates of PD in forensic and correctional adult male sexual offending samples. The chapter proceeds with a review of the psychopathy construct, its role and relevance in the commission of sexual violence, and its representation in sexual offending populations as moderated by victim profile. The chapter then reviews the risk-relevance of PD and psychopathy in sexual violence risk assessment and management, including the intersection of these diagnoses with other clinically and forensically meaningful risk constructs (e.g., sexual deviance). The chapter concludes with a discussion of sexual violence treatment and risk management considerations for psychopathy in sexual offending populations, including a model for treatment and a review of recent treatment outcome research.