Elachista caliginosa is a moth in the family Elachistidae. It was described by Parenti in 1983. It is found in Japan (Honshu) and the Russian Far East (Primorsky Kray).
The length of the forewings is 2.5âÂÂ3 mm for males and 2.7-3.2 mm for females
The larvae feed on Eccoilopus cotulifer and possibly Spodiopogon sibiricus. They mine the leaves of their host plant.