A Gastrostomy is the creation of an artificial external opening into the stomach for nutritional support or gastric decompression. Typically this would include an incision in the patient's epigastrium as part of a formal operation. When originally devised over a century ago the procedure was completed through open surgery using the Stamm technique. It can be performed through surgical approach, percutaneous approach by interventional radiology, percutaneous endoscopic gastrostomy (PEG) or percutaneous ultrasound gastrostomy (PUG).

A gastrostomy may be required due to illness, trauma or disability impacting upon the ability to eat or swallow safely, or conditions causing increased nutritional requirement and once formed (or for some techniques, during formation), a gastrostomy tube is inserted.