Loneliness is one fact of life experienced by most teenagers. Loneliness can occur in the environment around, at school and in the community. The purpose of this study to determine the relationshippersonality introverted and attachment to peers on loneliness in adolescents. This study uses a quantitative approach to the design of correlational. The subject of this research were 30 students in SMK Negeri 1 Kota Bima. The research instrument used introvertedpersonality, Inventory of Peer Attachment and UCLA LonelinessScale.Analysis of data using multiple regression. The results of the first regression testing found thatpersonality introverted significant effect on loneliness with regression coefficient 0.653. Furthermore peer attachment does not significantly influence the regression coefficient -0.093 loneliness.personality independent variable Introverted significant effect on loneliness, after controlling the variable viscosity peers with regression coefficient 0.758. Stickiness variables influence of peers on the dependent variable alone was not significant (p-value> 0.05; 0.061> 0.05).