Diduga albicosta is a moth of the family Erebidae first described by George Hampson in 1891.

It is found in India's Nilgiri Mountains, Sri Lanka and on Bali.

Forewings greyish with a white banded costal area and few dark scales on it.

Some white spots found on outer margin, which can be large and conjoined or small, separated.

Hindwings possess a large circular patch of modified scales near anal angle.