Syllepte crenilinealis is a moth in the Crambidae family. It was described by Hampson in 1918. It is found in Indonesia (Irian Jaya). The wingspan is about 40 mm. The forewings are pale rufous with a black antemedial line which is obsolescent at the costa, oblique and sinuous to the submedian fold, incurved at vein 1 and oblique to the inner margin. There is a small black spot in the upper part of the middle of the cell and an elliptical discoidal spot. The postmedial line is black, crenulate to below vein 3, then retracted to below the angle of the cell and excurved below the submedian fold. The terminal area is darker reddish brown. The hindwings are white, tinged with rufous. The terminal area is pale reddish brown, narrowing to a point at the submedian fold. There is a small dark spot