Shivering presents as a common perioperative problem causing increased metabolic demands, tachycardia and hypertension. It also interferes with routine monitoring like ECG, blood pressure and pulse oximerty. Shivering is seen approximately 40-60% after volatile anesthetics. It has also been observed that around 30% of patients under epidural anaesthesia develop shivering. Intra and post-operative shivering is distressing and unpleasant experience for the patient. The exact mechanism of shivering during spinal anaesthesia is not very clear. The possible reasons could be internal redistribution of heat from core to periphery, impaired central thermoregulatory mechanisms, peripheral vasodilatation and heat loss to the environment. Hence based on above findings the present study was planned for Comparative Assessment of Control of Intraoperative Shivering by Administration of Butorphanol and Clonidine under Spinal Anesthesia. The present study was planned in Department of Anaesthesia, Darbhanga Medical College and Hospital, Laheriasarai, Darbhanga, Bihar. In the present study 30 cases of the patients undergoing the surgeries of lower limb fractures, infra-umblical and urological surgeries under spinal anesthesia were enrolled. The 15 cases in Group B received an iv bolus of 1 mg (1 mL) Butorphanol. The 15 cases in Group C received an iv bolus of 150 μg (1 mL) clonidine. Further interventions and monitoring were done by an investigator blinded to the group allocation. The data generated from the present study concludes that Control of shivering is faster and better with Butorphanol than Clonidine. The incidence of recurrence is significantly less with Butorphanol than Clonidine. The incidence of hemodynamic variations (bradycardia / hypotension) is significantly higher with Clonidine as compared to Butorphanol.