Apantesis eureka is a moth of the family Erebidae. It was described by Douglas C. Ferguson and B. Christian Schmidt in 2007. It has been found in the United States along the edges of the Great Basin in central Utah and in southwestern Idaho. The length of the forewings is about 16.9 mm. There is a nearly complete set of pale bands on the forewings. The hindwings are orange red with a dark pattern. Adults are on wing from late April to mid-May.