Mimachrostia fasciata is a moth of the family Erebidae first described by Shigero Sugi in 1982.

[1] It is known from North Korea, South Korea, the Japanese islands Hokkaido and Honshu and Tsushima, the Russian Far East and China.

The habitat consists of rich broadleaved forests.

The wingspan is 13–15 mm for ssp.

M. f. fasciata and 10–12 mm for ssp.