Elachista olschwangi is a moth of the Elachistidae family that can be found in Russia (the Southern Ural Mountains). The wingspan is 10–11.4 mm. The forewing ground colour is creamy white, scattered with raised dark grey tipped scales. There are four indistinctly delimited transverse ochreous brown fasciae across forewings. The hindwings are dark grey with ochreous grey fringe scales.