Feces or faeces (or faeces) are solid or semi-solid residues of food that cannot be digested in the small intestine. Bacteria in the large intestine further break down the substance. Feces contain relatively small amounts of metabolic waste, such as bacterial altered bilirubin and dead epithelial cells from the intestinal wall.

In a process called defecation, the stool is discharged through the anus or cloaca.

Manure can be used as fertilizer or soil improver for agriculture. It can also be burned and used as a fuel source, or dried and used as a building material. Some medicinal uses have been found. In the case of human feces, fecal transplantation or fecal bacterial therapy is being used. Urine and feces together are called excrement.