Elachista synethes is a moth of the family Elachistidae which can be found in Australia and New Zealand.

[1] The wingspan is 6–8 millimetres (0.24–0.31 in) for males and 6.2–8 millimetres (0.24–0.31 in) for females.

The larvae feed on a wide range of grasses, including Bromus unioloides and have also been recorded on wheat.

They mine the blades of their host plant.

This article on a moth of the genus Elachista is a stub.