Damage byNezara viridula(L.) to developing soybeans caused significant changes in the chemical composition of the soybean oil. Palmitic, stearic, and oleic acid proportions of the oil increased, and linoleic and linolenic acids decreased as severity of stink bug damage increased. Similar trends were evident when artificial infestations of stink bugs at certain population densities resulted in increased incidence of beans with medium, heavy, and severe damage.