肠毒素（Enterotoxin），为引起葡萄球菌食物中毒的致病物质，根据抗原性分为A－I，8个血清型。由蛋白质组成，可溶于水，耐热。另外，此毒素还可引起猴、猫等动物引发呕吐现象，为毒素作用于肠道神经受体后，刺激呕吐中枢所致。极适合于高温的自然环境，又具高传染力，只要人与人接触就可以感染。

An enterotoxin is a protein exotoxin released by a microorganism that targets the intestines. Its target site is indicated within its name.

Enterotoxins are chromosomally encoded or plasmid encoded exotoxins that are produced and secreted from several bacterial organisms. They are often heat-stable, and are of low molecular weight and water-soluble. Enterotoxins are frequently cytotoxic and kill cells by altering the apical membrane permeability of the mucosal (epithelial) cells of the intestinal wall. They are mostly pore-forming toxins (mostly chloride pores), secreted by bacteria, that assemble to form pores in cell membranes. This causes the cells to die.