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The aim of this study was to assess the hearing threshold level in patients of diabetes mellitus, correlate degree of hearing loss with duration and severity of hyperglycemia and complications of diabetes mellitus. This prospective longitudinal study was carried out from November 2007 to October 2009. Patients of previously diagnosed cases of diabetes mellitus below 60 years of age were subjected to fasting and post-meal blood sugar levels and Pure Tone Audiometric tests. Seventy four percent diabetics were affected with sensorineural hearing loss. There was no statistically significant association between the age and the sex of diabetic patients with hearing loss. The results showed bilateral significantly high frequency, mild to moderate sensorineural hearing loss in uncontrolled diabetics as compared to those with controlled diabetes (p=0.001). Diabetics with poorly controlled blood sugar level have increased risk of hearing loss