Athymoris martialis is a moth in the Lecithoceridae family. It is found in Taiwan, Korea, southern China, and Japan. The wingspan is about 17 mm. The forewings are ochreous-whitish, slightly and irregularly sprinkled fuscous. The markings are formed by dark fuscous irroration. There is an irregular spot on the base of the costa and small marks representing the stigmata, the plical obliquely beyond the first discal, connected by a line continued to the middle of the dorsum, the second discal inwards-oblique. There are subtriangular spots on the costa before the middle and at two-thirds and there is also a fascia of scattered irroration at three-fourths, and another along the termen, broader towards the costa. The hindwings are light greyish, darker towards the apex.