The Population Council, in collaboration with TNS India Pvt. Ltd., undertook a study in Andhra Pradesh, India, to examine the patterns of male migration and its links with HIV risk. The goal was to provide evidence to inform the design and implementation of HIV interventions for male migrant workers. The study documented the volume and patterns of mobility, including the social dynamics within the contract system that employs these men as laborers, and the sexual risk behaviors and addictive behaviors of male migrants. The results suggest a predominance of interdistrict movements of men within Andhra Pradesh with a strong positive association between individuals\u27 degree of mobility and their sexual behavior. Moreover, an increase in degree of mobility is linked to inconsistent or nonuse of condoms, and there is limited knowledge of HIV infection among these recent male migrants. The study shows that there is a clear need for implementing interventions to prevent HIV infection in migrant workers and the authors of this report recommend the use of work-contract systems for delivering HIV-prevention interventions