Nessaea obrinus, the obrina olivewing, is a species of butterfly of the family Nymphalidae.

It is found from Colombia and the Guianas to the mouth of the Amazon and south to central Bolivia and Mato Grosso in Brazil, extending to northern Argentina.

Adults of subspecies faventia are on wing year round, but mainly from June to October and adults of subspecies lesoudieri are on wing year round, with no observed peak of abundance.

Obrina Olivewing butterflies are very unusual because they are one of the few animals with actual blue pigment.

[5] Other butterflies in Graphium and Papilio (specifically P. phorcas and P. weiskei) use the blue pigments phorcabilin and sarpedobilin.