Risoba obstructa is a species of moth of the family Nolidae first described by Frederic Moore in 1881.

Its distribution ranges from Sri Lanka and India to the Philippines, Solomon Islands and Australia.

There is an oblique white basal band, and red-brown costal area just beyond it.

Dorsal and lateral white speckled line and a sub-basal whitish streak series can be seen.

[3] The larva has been recorded on Quisqualis sp., Terminalia sp., Xylia sp., Lagerstroemia sp.