Thyas honesta is a species of moth of the superfamily Noctuoidea and the family Erebidae first described by Jacob Hübner in 1824.

It is found in the Indian subregion, Myanmar, Thailand, Peninsular Malaysia, Sumatra, Sri Lanka, Borneo and on the Philippines.

Jeremy Daniel Holloway (in his work The Moths of Borneo) lists this species as ranging down to Sumatra, while the sister species Thyas miniacea is listed from the Lesser Sunda Islands east, leaving Java unassigned.

Head and thorax reddish chestnut in colour, where the third joint of palpi black.

A curved postmedial series of white specks with an indistinct band beyond it angled at vein 6 and met by a dark streak from the apex.