Phiala simplex is a moth in the Eupterotidae family. It was described by Aurivillius in 1904. It is found in the Democratic Republic of Congo (Katanga), Malawi and Zimbabwe. The wingspan is 46 mm. The wings are snow-white, beyond the middle about 6 mm from the margin with a fine transverse line composed of black scales. This line is nearly erect in the forewings, gently arched and somewhat waved in the hindwings.