Elachista humilis is a moth of the Elachistidae family. It is found in most of Europe, except the Iberian Peninsula and the Balkan Peninsula.
The wingspan is 9–10 millimetres (0.35–0.39 in). Adults are on wing from May to July. There are two generations per year.
Larvae have been recorded on Agrostis, Anthoxanthum odoratum, Carex, Deschampsia cespitosa, Festuca, Holcus lanatus, Phalaris arundinacea and Poa pratensis, but Deschampsia cespitosa is the main hostplant. The other records are not all equally trustworthy because of possible confusion with Elachista canapennella.
The young larvae make a short corridor that is stuffed with frass in spring. After hibernation, they vacate this mine and make a number of elongated blotches, all descending from the leaf tip.