Objective: To examine the relationship between emotional well-being, patient activation and social support in a cohort of adults with severe obesity who underwent gastric bypass surgery from January to December 2012. Design: Cross-sectional survey. Subjects: Of a total population of 129 people, aged 18-68 years, at a local hospital in central Norway, 64 (50%) responding to the questionnaire, 52 (81%) being women. Main Outcome Measures: The World Health Organization-Five Well-Being Index (WHO-5), the 13-item Patient Activation Measure (PAM-13), a 16-item instrument on the frequency and content of social support, and demographic and clinical data. Results: A significant positive association was found between higher level of patient activation and better emotional well-being (P = 0.02) in linear regression analysis. A higher level of family support was significantly associated with better emotional well-being (practical social support from the family (P = 0.04), emotional social support from family (P = 0.01) and from friends (P = 0.005)). Conclusion: Screening tools for emotional well-being should be used systematically in postoperative consultations to recognize those who need a more individually tailored post-surgery follow-up care after gastric bypass surgery. In addition, health care providers in both specialist and primary health care settings should consider assessing the level of social support as part of regular follow-up routines.