Elachista adempta is a moth of the Elachistidae family. It is found in North America in Alberta, Saskatchewan, Colorado, Nebraska, Nevada, Utah and Wyoming. The length of the forewings is 4-6.3 mm. The ground colour of the forewings is white, usually with a brownish spot in the middle of the wing at the fold and another similar spot at two-thirds of the wing. The hindwings are whitish to light grey and the underside of the wings is grey.