Summary, Our aim was to examine all postoperative deaths in a colorectal surgical service. We retrospectively examined the records of patients dying within 30 days of surgery in the Colorectal Service, Wellington School of Medicine, New Zealand. There were 16 males (74.4 years) and 17 females (71.9 years). Nineteen patients were admitted during winter. Twenty-one patients underwent emergency operations. Consultants performed 26 operations. Perioperative blood transfusion was needed in 23 patients. Five patients died following surgery for colorectal perforation (! 1.6%). Major bleeding from the colon of rectum was the next commonest indication for surgery in those patients dying postoperatively (8.2%). The disease site was situated in or distal to the sigmoid colon in 22 patients. The postoperative mortality was lowest following right hemicolectomy (0.9%). Patients undergoing colonic bypass surgery had the highest postoperative mortality (12.5%). Patients with ischaemic or radiation-induced disease had high mortality rates (12.5%). 20% of patients suffering pulmonary embolism, 44.4% myocardial infarction, 43.8% congestive heart failure, 50.0% stroke, and 50.0% ARDS died postoperatively. Two patients died within 48 hours of surgery but the remaining deaths occurred after at least 5 days. In patients witb abdominal sepsis of compromised colonic blood flow the avoidance of anastomoses and the performance of peritoneal lavage may contribute to survival. In all other patients mortality is primarily determined by coexistent medical disease.