Elachista gangabella is a moth of the family Elachistidae. It is found in all of Europe, except the Iberian Peninsula.
The wingspan is . The head is blackish-grey. Forewings are blackish; a straight somewhat inwardly oblique central whitish-yellowish fascia, in male narrowed towards costa; tips of apical cilia whitish. Hindwings are dark grey. The larva is grey-green, yellowish-tinged; head yellow-brown; 2 with two pale brown spots.
Adults are on wing from March to June.
The larvae feed on tor-grass (Brachypodium pinnatum), false-brome (Brachypodium sylvaticum), cock's-foot (Dactylis glomerata) and mountain melick (Melica nutans). They mine the leaves of their host plant. Larvae can be found from September to November.