It is estimated that 23% of the adults and adolescents living with HIV in the United States are female. The Division of HIV/AIDS Prevention at the Centers for Disease Control and Prevention (CDC) funds evidence-based interventions (EBIs) to reduce HIV risk behaviors, including HIV prevention programs for people living with HIV and their partners. While EBIs have been shown to be effective in controlled research environments, there are limited data on intervention implementation in real-world settings. Women Involved in Life Learning from Other Women (WILLOW) is a four-session small-group intervention that targets heterosexual women aged 18-50 who are living with HIV. This evaluation assessed changes in participants' HIV knowledge, attitudes, beliefs and risk behaviors. A repeated measures design was used to collect participant risk behaviors at baseline, and again at three and six months post-intervention. Changes in attitudes, beliefs, and risk behaviors were assessed using generalized estimating equations. After participation in WILLOW, participants reported increased HIV knowledge, attitudes and beliefs, being more supportive of condom use, and reduced prevalence of HIV risk behaviors. Findings suggest that the WILLOW intervention can be successfully delivered by community-based organizations to reduce HIV risk behaviors among members of this high-risk population.