Ostrinia furnacalis is a species of moth in the family Crambidae, the grass moths. It is known by the common name Asian corn borer. Its distribution extends from China to Australia. It is well known as an agricultural pest on several crops, especially corn. It is one of the worst corn pests in Japan and China. It has invaded corn crops in Guam and the Northern Mariana Islands. It can be found in Java, Sulawesi, the Philippines, Borneo, New Guinea, the Solomon Islands, and Micronesia. It is likely the worst pest insect on corn in the western Pacific region of Asia, and one of the worst pests overall, second only to maize downy mildew. This moth is a close relative of the European corn borer (O. nubilalis).