Background: Postoperative shivering, along with nausea and vomiting, is a common source of discomfort for patients recovering from general anesthesia. A key differentiator between shivering in postanesthetic patients and shivering in fully awake individuals, as observed in electromyogram recordings, is the presence of clonus. This clonus resembles the pattern seen in patients with spinal cord transection. Clonus occurs alongside the typical waxing and waning electrical activity seen with thermoregulatory shivering, which is linked to cutaneous vasoconstriction. The primary cause of postanesthetic shivering is intraoperative hypothermia, which results from anesthetic-induced suppression of the body’s temperature regulation mechanisms. Additionally, shivering can occur with cutaneous vasodilatation (non-thermoregulatory shivering), which is often attributed to postoperative pain. Aims and Objectives: The aim was to determine the know the incidence of post halothane anaesthesia shivering and to study the efficacy of Pethidine in treating the post halothane anaesthesia shivering. Materials and Methods: The present study was carried out in 500 adult patients of ASA grade 1 of either sex between 18 to 50 years of age undergoing major surgery under general anesthesia with the aim of studying the incidence of post halothane anaesthesia shivering and to know efficacy of pethidine in treating the post-halothane anesthesia shivering. Results: It was found that Overall incidence of shivering upon emergence from halothane anesthesia was 22 % (110/500). Sufficient precautionary measures both intra operatively and post operatively reduced the incidence of shivering. Males showed an increased incidence of shivering 57.27% (63/110) as compared to females 42.73% (47/110). Shivering was predominantly seen in patient who had greater fall in core temperature during anaesthesia. Conclusion: Shivering following halothane anesthesia is a known complication. When shivering occurs, oxygen demand of the body increases to 200 to 400 % above the normal. The incidence of post halothane shivering can be minimized by taking proper precautions for fall in core temperature and minimizing the duration of anaesthesia. Pethidine is very effective in treating post halothane anaesthesia shivering and is without any side effects.