Background: Considering the importance of social well-being and the associated factors, this study was designed to investigate status ofsocial well-being and its predictive determinants in an Iranian group of high school teenagers during first half of 2019.Methods:An analytical cross-sectional study was conducted on 680 participants. Demographic information were collected consisting of age, gender, birth rank, weight, height, economic status of family, education of parents, place of living and family size. The Persian version of Keyes's social well-being questionnaire was used.This questionnaire had parts for social actualization, social coherence, integration, social acceptance and social contribution.Results: Overall status wise, 13.1% had good status, 80.4% had average status and 6.5% had poor status of social well-being. Urban residency was associated with better score (P=0.036). No significant association was observed for age, gender, year of education, having health insurance and birth rank. Educational status of mother was significantly associated with the overall score in favor of positive association for university education (P=0.046). No significant association was found for father education, mother job and father job. Chronic disorders of the students were associated with decreased overall score (P=0.019). History of smoking was associated with decreased overall score (P=0.001). History of regular physical activity was associated with increased overall score (P<0.001). No significant association was found for existence of parental chronic disorder. Conclusion:In the present part of Iran, social well-being has an average status among high school students. Knowing the related factors help us for better planning.