Background and aims: This study investigated the clinical manifestations, outcomes and long-term complications of COVID-19 inpatients in Bangladesh while emphasizing on individuals having diabetes. Methods: A cross-sectional study was conducted for a sample of COVID-19 inpatients across four different hospitals of Bangladesh between April 1st and June 30, 2020. Variation in clinical characteristics, contact history, comorbidities, treatment pattern, and long-term complications were investigated. Results: There were 734 COVID-19 presentations in this study of which 19.8% of patients had diabetes. 76% were male and 85% of the patients had been administered with all vaccine doses during childhood. The most frequently occurring blood groups among patients with diabetes were B (+) ve (35%) and O (+) ve (31%). Among biochemical parameters, glucose, D-dimer, C- reactive protein (CRP) and Troponin levels were significantly elevated amidst the cohort with diabetes. The frequency of insulin dependent individuals increased three-fold during COVID-19. A number of COVID-19 patients with diabetes have been suffering from long term complications post recovery including pain, discomfort, memory loss and sleep disturbance. Conclusion: Individuals with diabetes have experienced severe manifestation of COVID-19 and post disease complications. Further in-depth studies focused on larger sample sizes are entailed to assess the relationships elaborately.