Practicing psychologists are providing services to persons with HIV infection and those at-risk for AIDS. However, most practitioners have not received formal training about HIV/AIDS. In this study, the majority of psychologists surveyed had treated persons at-risk for the virus but had not received HIV/AIDS information in formal educational programs. Most respondents obtained knowledge through popular media. There is a growing body of specialized knowledge about HIV/AIDS for mental health professionals. In addition to better serving HIV-infected clients, psychologists with current multidisciplinary HIV/AIDS knowledge will be valuable members of health care teams.