The Brighton wainscot (Oria musculosa) is a moth of the family Noctuidae.

[1] It is nationally scarce in Britain where it may be confined to Salisbury Plain,[2] and was pronounced extinct as a resident species by 2013.

Forewing whitish ochreous suffused with yellowish, the pale ground colour showing as streaks along the folds and an oblique streak from apex to end of cell, where the reniform is marked by a pale blotch with a grey spot at its lower end: veins towards termen grey-tinged; hindwing whitish, washed with grey, the veins darker; laeta Alph.

Larva pale greenish, with four dark lines at even distances apart, forming spots on the anal segment; head redbrown; thoracic plate yellow; spiracles black.

The larvae feed internally from autumn to spring in the stems of cereal crops.