Human papillomavirus (HPV) infection is causally related to several benign and malignant diseases of the anogenital tract. In this article the authors detail the epidemiology, methods of transmission and risk factors, pathogenesis, and oncogenesis of HPV, and describe clinical manifestations and current treatments. Special attention is given to condyloma acuminatum and noncervical anogenital intraepithelial neoplasia. The authors conclude with the latest information on prophylactic vaccine development and prospects for future control of HPV-related disease.