Thudaca obliquella is a moth in the family Depressariidae.

It is found in Australia, where it has been recorded from New South Wales,[1] Queensland, the Australian Capital Territory, Tasmania and South Australia.

Adults are similar to Thudaca mimodora, but the forewings have the first transverse streak without a dark bar above the middle, the second transverse streak is without a dark bar above the lower end and there is a blackish line along the hindmargin.

The hindwings are lighter grey, suffused with pale whitish ochreous.

This article on a moth of the subfamily Hypertrophinae is a stub.