Introduction:Lifelong medical management is the main intervention to reduce diabetesrelated morbidities and premature deaths; yet, social support can be a vital intervention to improve diabetics' health. Therefore, this study aimed to determine the magnitude, types, and role of social support in diabetes management in southern Ethiopia. Methods: A multi-stage systematic sampling was applied to recruit 634 adult diabetics from the three-tiered healthcare system in the region. We proportionally distributed the sample size between randomly selected ten health-care facilities across the hierarchy. Pretested questionnaires and checklist; Epi-Info, and SPSS software used for data collection; entry, and analyses, respectively, and the statistical significance was determined at a P-value ≤0.05. Results: A total of 240 females and 356 males completed the study, and the overall magnitude of the social support was 50.20% [95% CI: 46.19%, 54.21%], and it was categorized into non-material and material with 44.13% [95% CI: 40.14%, 48.12%] and 34.23% [95% CI: 30.42%, 38.04%] magnitudes, respectively, and social support was left to the patients' families and friends whereas formal institutions and the public sectors were rarely offering when the patients needed it. Though sex, educational level, and health-care hierarchy were not significantly associated with the social support, residence, some occupations, presence of diabetic family members, acute medical conditions, blood glucose level, compliance to medical follow-ups, treatment adherence, and taking anti-diabetic drugs a day before the current visit to health-care facility were all statistically significantly associated with social support. Conclusion: One of every two adult diabetic patients in southern Ethiopia was receiving any social support, and social support for diabetic people reduces medical follow-ups absenteeism, improves treatment adherence, glycemic level controlling, and helps lifestyle modifications. Therefore, to keep diabetic people healthy and achieve diabetes management goals, the Ethiopian healthcare system, institutions, and concerned stakeholders should strengthen the social support for diabetic patients.