A mycotoxin (from Greek μύκης (mykes, mukos) "fungus" and τοξικόν (toxikon) "poison") is a toxic secondary metabolite produced by organisms of the fungi kingdom, commonly known as molds. The term 'mycotoxin' is usually reserved for the toxic chemical products produced by fungi that readily colonize crops. One mold species may produce many different mycotoxins, and the same mycotoxin may be produced by several species.

A mycotoxin (from Greek μύκης (mykes, mukos) "fungus" and τοξικόν (toxikon) "poison") is a toxic secondary metabolite produced by organisms of the fungi kingdom, commonly known as molds. The term 'mycotoxin' is usually reserved for the toxic chemical products produced by fungi that readily colonize crops. One mold species may produce many different mycotoxins, and the same mycotoxin may be produced by several species.