Internet has become a crucial factor affecting children’s lives. Accordingly, researchers are paying attention to patterns and predictors of Internet use among children. However, little research exists on the relationship between family functioning and Internet use. In response to this gap, this study examines the association between family functioning and Internet use among school-aged children. As primary analyses, structural equation modeling was employed and gender differences were examined. The findings highlight the importance of family functioning on Internet use among school-aged children. Lower levels of family functioning led to more time using the Internet and was mediated by the purposes of Internet usage. The findings suggest that parental and community efforts to improve family functioning may prevent Internet overuse or misuse among school-aged children. Also, there is a need to consider gender differences regarding Internet use within the context of policy-making.