Background: Using continuous glucose monitoring, compare glycemic variability (GV) indices between patients with fibrocalculous pancreatic diabetes (FCPD) and type 2 diabetes mellitus (T2D) (CGM). Methods: We calculated GV indices in 61 patients with FCPD and T2D who were matched for HbA1c and diabetes duration. The CGM-derived measures of GV (SD, mean amplitude of glycemic excursion [MAGE], continuous overall net glycemic action [CONGA], absolute means of daily differences [MODD], M value, and coefficient of variance [percent CV]) and hypoglycemia (time spent below 70mg/dL, AUC below 70mg/dL, glycemic risk assessment diabetes equation hypoglycemia, Low Blood Glucose Index), and hyperglycemia (time spent above 180mg/dL at night [TSA > 180], AUC above 180mg/dL [AUC > 180], glycemic risk assessment diabetes equation hyperglycemia, High Blood Glucose Index [HBGI], and J index).The relationship between GV indices and HbA1c, diabetes duration, and demographic and biochemical data was also investigated