What kind of doctor that perform a surgery on stomach?

A gastroenterologist, a doctor who specializes in the digestive system, is the type of doctor who would typically perform a surgery on the stomach. If the surgery is related to the stomach, such as a gastrectomy (removal of the stomach) or a gastric bypass (alteration of the stomach's connection to the intestines for weight loss), a gastroenterologist would be the most qualified medical professional to perform it.