This study reports an outcome assessment on an HIV peer education intervention at the main campus of Kenyatta University in Nairobi, Kenya. A quasiexperimental separate sample pretest-posttest design was used. Campuswide baseline and endline surveys were conducted with 632 and 746 students, respectively, soliciting information on HIV-related knowledge, attitudes, and behavior. After 2 years of on-campus intervention, no changes in behavior were evident with respect to either abstinence or number of sexual partners. Small but statistically significant changes were found in condom attitudes and behavior, and a large increase in HIV testing was evident. It is recommended that future research more specifically compare abstinence versus multiple option peer education programs, giving special attention to the role of peer educators as models.