Cydosia nobilitella, the curve-lined cydosia moth or regal cydosia moth, is a moth of the family Noctuidae.

The species was first described by Pieter Cramer in 1779.

It is found from southern Florida[1] south to Argentina, and is also found in the Antilles.

[2] The wingspan is 20–25 mm The larvae have been recorded feeding on Spigelia anthelmia.

This Acontiinae article is a stub.