Ethmia powelli is a moth in the Depressariidae family. It is found in the Florida Keys in the United States. The length of the forewings is 4-4.7 mm for males and 4.1-4.9 mm for females. The ground color of the forewings is silvery white with numerous black spots. The ground color of the hindwings is unicolorous pale gray with dark gray at margin. Adults are on wing in June and August.