The authors examined the influence of parent-adolescent communication quality, as perceived by the adolescents, on the link between adolescents' Internet use and loneliness, controlling for perceived family support in general terms. Adolescents (N = 216, M[subscript age] = 15.80 years) provided data on Internet use, loneliness, Internet-related parent-adolescent communication, and perceived family support. Moderated regression analyses showed that Internet-related communication quality determined whether more extensive Internet use was associated with more loneliness. This moderation effect remained significant when perceived family support in general terms was controlled for. Gender and age of the participants did not influence the findings. Implications for successful Internet-related parenting strategies are discussed. (Contains 1 figure and 2 tables.)