BackgroundPeople with diabetes are more at risk of covid-19. Perceived social support plays an important role in maintaining people’s health and reducing the negative effects of stress caused by the environment and society. The present study was designed and implemented with the purpose of determining the effect of educational intervention based on social support theory in reducing stress caused by the covid-19 pandemic in people with diabetes.MethodsThe current investigation was an interventional and semi-experimental study conducted on 212 patients diagnosed with type 2 diabetes. Eligible participants were diabetic individuals capable of utilizing virtual platforms and not afflicted with COVID-19. Exclusion criteria encompassed unwillingness to continue study participation, absence from multiple training sessions, and development of a specific illness during the study period. Random allocation placed patients into either the control or intervention group. The intervention group received educational materials via WhatsApp, while the control group did not receive any intervention. The researcher administered a questionnaire to collect demographic information and assess perceived social support among the patients. Data analysis involved the use of chi-square tests, independent and paired t-tests, as well as ANCOVA.ResultsThis study revealed that the mean age of patients in the control and intervention groups was 46.35 ± 14.15 and 51.72 ± 11.57, respectively. Most of the diabetic patients in both groups were female, married, had a diploma, were housekeepers, and had an income between 2 and 5 million Tomans. According to the results obtained in all subscales of social support theory as well as the perceived stress score due to the corona pandemic after the educational intervention, a statistically significant difference was observed between the two groups (P < 0.05), so that the score of all subscales of social support theory in the intervention group was higher than the control group. But the perceived stress score caused by Corona in the intervention group was significantly lower than the control group.ConclusionThe results of this study illustrate the noteworthy influence of social support training in lessening perceived stress among patients with diabetes during the COVID-19 pandemic. Consequently, healthcare providers are encouraged to integrate social support education programs into comprehensive care initiatives for diabetic patients, particularly during periods of heightened stress like the current coronavirus pandemic.