Health Psychology Vol. 38, Iss. 2,  (Feb 2019): 122-132. DOI:10.1037/hea0000710 Objective: Effective diabetes self-management can prevent long-term health complications but is often complex and difficult to achieve. Health care professionals’ support for patients’ autonomy (autonomy support) in managing their diabetes contributes to better diabetes self-care and glycemic control. Most adults with diabetes also receive self-management support from informal health supporters. Yet, the role of autonomy support from these informal health supporters has not been explored. We examined patients’ perceived autonomy support from their main health supporter (family member or friend) in relation to their diabetes distress, self-efficacy, self-monitoring of blood glucose (SMBG), medication adherence, and hemoglobin A1c (HbA1c).. To read the full article, log in using your NHS OpenAthens details.