This study examined the moderating effects of family cohesion on the relationship between community violence and child internalizing and externalizing problems at age 18. The study sample consisted of 728 children and families who were part of the Infant Health and Development Program, an intervention study for low-birthweight, preterm infants. Six of eight sites in the Infant Health and Development Program were in large metropolitan areas; two served rural and urban areas. About half of the sample was African American. Research teams collected data from caregivers multiple times in the first 3 years of the target child's life, and at 4, 5, 6½, 8, and 18 years. Caregivers reported on community violence, neighborhood problems with (a) drug users/sellers; (b) delinquent gangs; and (c) crime, assaults, and burglaries reports when children were 4, 5, and 8 years of age. Family cohesion was assessed twice, at ages 6½ and 8 years, using caregiver reports on the Family Environment Scale. Adolescent self-report of Internalizing and Externalizing Behavior Problems at age 18 were assessed using the Behavior Problems Index. In this study, the association between adolescent psychosocial outcomes and community violence were moderated by family cohesion and gender such that being in a highly cohesive family as a child protected male children from the negative effects of community violence. Findings demonstrate the long-term protective effects of family cohesion on child behavioral development for male children but suggest a need to examine additional supports for females exposed to community violence during childhood.