Colon surgery comprises a high number of patients treated in a gastrointestinal surgery department. Like any major surgery, it may present diverse surgical and medical postoperative complications. In this article we review the most frequent surgical complications of colon surgery: abdominal sepsis, postoperative ileus, bleeding, fistula, evisceration, ureteral lesion, colostomy problems and damage to upper mesenteric vessels. Every colorectal surgeon must know all the possible complications of colon surgery to achieve an early diagnosis and correct management.